Types of moisture meters and their use in modern industries

At different stages of production of certain products, monitoring storage conditions of materials and raw materials, etc., there is a need to regularly analyze the moisture concentration in samples of these products and materials. For this purpose, it is customary to use modern high-tech devices - moisture meters. As you can easily guess from the name, a moisture meter is a device used to calculate the percentage of moisture in gaseous, solid and bulk materials.

Popular models of moisture meters

There are a large number of models designed for highly targeted and varied measurements of moisture concentration. Some devices are equipped with additional functionality, for example, determining the temperature of the object of study and the environment, calculating average values ​​for multiple measurements, and measuring air humidity.

The most popular are simple models of moisture meters with a budget price and sufficient capabilities.

The EM4806 device can measure the concentration of water in wood and building materials upon surface contact. The minimum recorded moisture is 5%, the maximum can reach 42%. The moisture meter operates in a wide temperature range, provides data with an error of no more than 2%, and has the most affordable price for the consumer.

The GMH 3830 device uses a probe to measure humidity up to 100% in material at a depth of up to 40 cm. The moisture meter operates at negative (up to – 25 °C) and positive (up to + 50 °C) temperatures.

A moisture meter with the trade name Hydro Pro determines the mass fraction of water in wood in the concentration range from 2% to a maximum content of 65% at a depth of 3.5 cm. The device operates only at positive temperatures, the value of which does not exceed 40 °C.

The range of measuring instruments for wood allows each consumer involved in its amateur or professional processing to select the most acceptable model. In general, contactless devices are noticeably more expensive than other devices. Having assessed your needs and opportunities, it makes sense to talk with a consultant and make an informed choice.

Additional features

Some meters have a function for measuring air humidity. This parameter can be used to check the water content in the environment in the raw material storage warehouse, drying chamber, workshop and finished goods warehouse. A device with such bells and whistles may cost more, but often the function justifies itself.

Another function is to determine the ambient temperature and air temperature. Useful for monitoring the process in the drying chamber.

Function for calculating the average value. As a rule, to accurately measure the presence of water in wood, you need to take several measurements and calculate the average value. Some manufacturers have introduced a function for calculating average humidity for their devices.

Needle meters

The contact method of deep humidity measurement is carried out using needle devices, the action of which is based on the conductometric determination of the electrical conductivity of the object of study.

Rigid thin metal needles are introduced into lumber and wood raw materials, which record the value of electrical resistance. The value is converted into a humidity indicator, which can be immediately seen on the display.

To obtain completely reliable information, the result must be checked with the special attached tables that take into account the influence of the medium temperature on the measurement accuracy.

To examine wooden boards, moisture meters with short needles are often used, which allows some marketers to present the devices as surface devices. In fact, they are not, because the defining elements are the needles inserted into the wood. The depth of surface damage when taking measurements with such a device is less than when using a conventional needle device.

Conductometric determinations make it possible to record moisture concentrations whose values ​​are greater than 5%. To study objects with a lower concentration of water molecules, you need a high voltage source with characteristics from 500 to 1500 volts, which is impossible to achieve when using portable moisture meters.

Non-contact hygrometers

The constant need to determine moisture content accompanies the process of producing boards from chips and wood fibers, arranged randomly or in an orderly manner. Non-contact wood moisture meters, which are installed above conveyor belts, are convenient for these purposes. The devices can determine the concentration of water molecules by scanning the material with ultraviolet or microwave light.

Ultraviolet provides the most accurate values ​​for products at room temperature. If the product has not yet cooled down after technological heat treatment, moisture readings can be very approximate.

Microwave detection is insensitive to temperatures but initially provides less accurate moisture concentration values.

Purpose and types of moisture meters

Standard methods for identifying the mass fraction of water in wood raw materials are based on determining the weight of the sample before and after drying when it reaches a constant weight. The procedure is carried out in several stages and requires careful execution and a long time.

In practice, there is often a need to quickly determine the moisture content of raw materials or wood products, which can be done using special compact meters.

There are several types of devices that differ in operating principles. Definitions could be as follows:

• optical;
• radiometric;
• inductive;
• infrared;
• ultra-high frequency;
• combined action.

The devices differ in the accuracy of measurements, the range of concentrations to be recorded, and the type of impact on wood.

We study the tool: moisture meters for wood and the nuances of their use

Wood is an environmentally friendly material, in demand in the construction of various types of objects, at all stages of construction and installation work, as well as in the manufacture of furniture and interior items. To determine the quality of wood, there are special instruments and devices that facilitate the implementation of work on incoming control of raw materials and compliance with production technologies for products and blanks made from wood. Moisture meters for wood - types and descriptions of popular models, how to choose, as well as an overview of prices for the most popular models, this is the topic of this article.

How to choose?

First of all, when choosing any device, including a moisture meter, you need to clearly understand what you are going to use it for. If the hygrometer is intended to measure the moisture content of wood building materials, a cheaper and simpler needle moisture meter will suit you. If you are going to work not only with wood, but also with its, so to speak, derivatives - chipboard, MDF, sawdust, as well as plasterboard, alabaster and other materials, you better choose a more advanced and accurate model among non-contact devices.

Pay attention to the country and manufacturer. It is believed that the best quality measuring instruments are supplied to us by the Old World (Europe)

But among Russian and Chinese factories there are many whose products meet all international standards. They were mentioned above.

Carefully look through the passport of the intended purchase. All the main technical characteristics of the product must be indicated there, including the maximum measurement error. The best option is considered to be devices in which this figure does not exceed 3%. The cost and dimensions of the device also affect its commercial attractiveness. Agree, would you rather buy a compact device that is comfortable to hold and use than a more bulky analogue? There is nothing to say about the price - why pay more? And, of course, additional devices and improvements to the device are a pleasant bonus.

What to look for when choosing

Let's consider what criteria should be taken into account in order to make a successful purchase.

• When choosing a moisture meter, the main criterion is the type of unit. There are two types: contact and non-contact.

1. Contact (needle). Equipped with small metal needles, which must be immersed in specially prepared holes in the product. After this, the device will begin to create electrical resistance between the needles and the material. Working with this type is quite simple, but the product being tested suffers.
2. Non-contact (dielcometric). Created on the basis of a radio frequency generator, which allows you to get a fairly accurate result. The device does not affect the quality of the product being tested.

• Cost of the device. Don't buy an overly expensive model. Their work follows the same principle, which means it makes no sense to overpay for a model whose manufacturers are simply luring buyers.
• Size. The comfort of use depends on the size of the device. Pay attention to the medium-sized model so that it fits easily in your hand. Otherwise, what is the use of a device if it cannot be used?

Instruments for surface measurements

Devices that record the dielectric constant of an object can work when placed on the surface of wood. The material does not undergo mechanical damage, so the method is suitable for working with finished products.

Reading of the required values ​​when implementing the dielcometric method of determination occurs using a radio frequency generator, which produces waves with a frequency from 3 MHz to 30 MHz. When the contact part of the device is pressed against wood, the signal penetrates into the depth of the material to a distance of up to 30 mm. Based on the signal attenuation, the microprocessor records the dielectric constant and recalculates it into a humidity indicator.

Any performer can use the device without special training. It is enough to enter information about the type of wood, lean the device against the surface of the object with the contact part, press the button and look at the number that appears on the display of the moisture meter. The device provides accurate moisture content information at concentrations greater than 1%. If the mass fraction of water in the wood is less, the readings may have an error.

Equipment options

A device for measuring humidity is called a hygrometer. There are certain standards that the climate in the house must meet. In winter, moisture is allowed at 30-40%, and in summer – 30-60%. Testing devices are made from different materials, which, under the influence of moisture, change their characteristics: they lengthen, become heavier, etc. The range of equipment is quite extensive, to suit different tastes and budgets.

Home appliances should be convenient and compact Source alicdn.com

Device on hair and film

Hair devices have a simple design. The main element of the device is synthetic hair, which is pre-degreased. When the state of the air changes, a change in its length can be observed. The hair is stretched between the spring and the arrow end. Under the influence of vibrations of the hair, the arrow moves along the plate with divisions, from which the values ​​are determined.

The device covers values ​​from 0 to 100. Therefore, detailed information about the state of the air can be obtained. The device is easy to use. It can be placed on the wall and constantly monitor the humidity level.

The principle of operation of a hair hygrometer Source prezentacii.info

There are also film hygrometers. The main element in them is a special film of organic origin. Under certain conditions, it can stretch or contract; these changes are visible on the dial of the device.

Measuring humidity with these devices is practiced in rooms with low temperatures.

Determination of humidity using condensate

The devices determine absolute humidity. They are used in laboratory conditions; they are not suitable for home use.

Condensation meters consist of a flat surface onto which moisture settles, a thermometer to detect condensation, and a beam of light to capture the first condensation.

The device allows you to get the most accurate results, displaying the climate situation in the room. It consists of a metal box, a thermometer, a rubber bulb, a heat-insulating gasket, a front wall, and a ring.

Such devices provide highly accurate results, which is necessary for laboratory research.

The condensation hygrometer is more suitable for scientific research in laboratories Source prezentacii.info

See also: Catalog of companies that specialize in the design and complex installation of utility networks and systems

They analyze the temperature and condensation deposited on the glass. A beam of light is directed onto the mirror, whose temperature gradually decreases, causing drops of water or ice crystals to form on the surface. An electronic thermometer under the mirror detects the temperature, and the design converts the data into humidity parameters.

There are options for improved modification. They have a built-in display on which readings are displayed. The main advantage of the equipment is its long service life and stable performance. The devices have an increased range of action and cover results from 0 to 100%.

Device with two thermometers

The action of the psychrometer is based on the interaction of a dry and wet thermometer. The device is equipped with two thermometers, which contain red and blue liquid.

On one tube there is a cotton cloth, part of which is located in a reservoir with a solution. Once the fabric is wet, the moisture evaporates and the wet bulb thermometer cools. To determine the percentage in the table for the humidity determination device, you need to find the value indicated on the thermometer and calculate the difference at the intersection of the indicators.

Psychrometer is actively used in residential premises Source mypresentation.ru

Psychrometers are:

• Stationary. With a dry and wet thermometer and the principle of determining humidity according to the table;
• Aspiration. The design includes a fan that blows air onto the thermometers to speed up the measurement process;
• Remote. These are pressure gauge and electrical instruments with silicon sensors.

Purpose and types

A moisture meter is an electronic device designed to determine the moisture content as a percentage of the mass of the object being tested.

According to their purpose, such devices are classified as follows: for wood and bulk materials, for soil and soil, as well as other building materials.

Moisture meters for wood are used in woodworking and processing enterprises, in furniture and construction industries.

Using a moisture meter allows you to control the quality of the lumber used

Based on their design, moisture meters are classified as follows:

• needle - have two sharp electrodes that are immersed in a wooden surface, after which a measurement is performed;
• non-contact – they work without immersion in the material being tested; for this, just touching it is enough;
• surface measurement - similar in design to needle models, but differ in that when they are used, the needles of the device are only slightly immersed in the surface of the material being tested;
• depth measurement - massive instruments for professional use, when examining large volumes of lumber, sawdust and products made from them (fuel briquettes, pellets, etc.).

Needle type device, model “Testo 606-1”

Needle moisture meters for wood

Needle models, called conductometric devices, are calibrated for specific types of wood that differ in their resistivity.

When an electrical pulse passes, the meter compares the readings contained in it for a specific type of wood with the result obtained, which is reflected on the display.

The advantages of devices of this type are the following indicators:

• ease of use;
• high measurement accuracy;
• relatively low cost.

Disadvantages are also present, these include the following indicators, such as:

• during measurements, the surface of the material or product being tested is damaged;
• the measurement limit does not allow measuring humidity when its level is below 4%.

Dielectric type device, model “Testo 616”

Non-contact moisture meters for wood

Devices operating on a non-contact principle have a radio frequency generator in their design; they are called dielectric moisture meters.

When using devices of this type, it is necessary to apply a special contact surface to the measurement object or move it to a certain distance, which depends on the model of the device and the type of measurements being performed.

The advantages of meters of this type are the following indicators:

• the wood is not damaged during measurements;
• low percentage of error in the results obtained;
• The presence of memory makes it easier to use when taking measurements.

Disadvantages include high cost and the inability to carry out repairs on your own.

Using a dielcometric model when checking the moisture content of board materials (chipboards)

Types of humidity measuring instruments

For all of the above tasks, manufacturers began to make the following devices.

Laboratory

Such instruments are used to test the water content of shredded wood. Their accuracy is quite high, which is facilitated by very precise scales (up to 0.001 g). Such devices in Russia are manufactured under the EVLAS brand in the city of Novosibirsk. We had their device in our laboratory.

It shows good results for the first six months, and then it needs to be repaired, and so on every year.

Therefore, I will not recommend it to my readers.

Contactless portable

Used to check moisture without damaging wood. The disadvantage is that they are quite unstable to measuring hot materials and there is a large error in measurements.

In addition, areas with increased resin content of boards after drying are measured poorly. They are used in the production of molded products and spliced ​​products, in places where damage to the material is unacceptable.

Needle portable

Portable moisture meters can be of several types:

• For boards, compact pocket ones with a short needle. Their advantage is mobility; the master can always carry it in his pocket. Flaws, moisture checks on the surface of the board and small marks remaining on the finished product. Judging by the reviews and taking into account my experience, we can say that these are the optimal devices for measuring boards. They are compact and precise;

• Less compact and more bulky depth measuring devices with a mechanism for driving needles into thick boards. In my opinion, these devices are the most accurate, since they can measure humidity in the central part of the board. The disadvantage is that the needles in the board often break; this is unpleasant, especially in cases of unfair use of the device. For example, they measured the humidity, broke the needle and did not pull it out of the board. Then very expensive tools break down on a four-sided machine.

Portable for bulk materials

Here you can find two types of meters:

• Contactless, like their other counterparts, have measurement errors;
• Needle deep. These are quite good for measuring the moisture content of wood chips in piles.

Non-contact in-line stationary for chopped wood

Non-contact flow meters are more commonly used to measure chip moisture. Used in the production of particle boards, MDF, OSB. Installed above chip conveyors.

They are divided into:

1. Ultraviolet. They provide maximum measurement accuracy, but show negative results with warm or hot chips;
2. Microwave. Less accurate than ultraviolet, but more resistant to changes in chip moisture.

Needle stationary

Such devices are used in drying chambers. They differ from portable ones in that they are used constantly. Based on their readings, the stages of the drying process in the drying chamber are switched.

GMH 3830

This device is universal. It can be used to take moisture measurements not only in wood, but also in materials such as:

• cardboard and paper;
• cork and textiles;
• concrete and aerated concrete;
• brick, plaster, etc.

Advantages:

• shows the direct value of the moisture content in %;
• user-friendly interface;
• good temperature compensation;
• ease of maintenance;
• automatic shutdown.

The disadvantage is the high price.

As a conclusion, we note that you should select a moisture meter individually, taking into account the specific situations in which you will use it. Happy shopping!

Devices for building materials

These devices are designed for measuring moisture in plaster, drywall, concrete and brick. Inies are light in weight, compact in size and have low accuracy.

Megeon 20550

The device will quickly determine the moisture content of building materials. It has high functionality. The device can measure not only humidity, but also temperature, as well as the mass of individual bulk materials. The kit includes a measuring cup, with which it is convenient to carry out analysis. The device is equipped with the option of adjusting the taken indicators. Humidity is measured in the range from 3 to 35%. Users have no complaints about the operation of the device. It is inferior in characteristics only to the winner of the rating.

Megeon 20550

Advantages:

• the presence of a large number of additional options;
• The set includes a measuring cup;
• data can be corrected;
• The small monitor is backlit.

Flaws:

• small humidity measurement range;
• high cost.

Testo 606-2 16

The price of the device is 9,000 rubles. It has the functions of a moisture meter, thermometer and hygrometer. Using the device, you can measure the humidity and temperature of brick, concrete, and screed. The device will also determine the moisture content in the air. The device body is reliably protected from moisture penetration. It can be used both at home and outdoors. Users note the high reliability of the device, long service life and low error. Light weight and small dimensions make the device convenient to use. Buyers cite only the high price as a disadvantage.

Testo 606-2 16

Advantages:

• high functionality;
• the body is not afraid of moisture penetration;
• low error;
• long service life.

Flaws:

• high price.

Control Hydro Pro new

This device can be found in stores for 11,050 rubles. The product is intended for measuring the moisture content in concrete. The specialization is quite narrow. However, the high price is compensated by the high accuracy of the readings taken and the availability of additional options. The advantage of the device is the ability to take measurements without contact. The manufacturer has developed an external sensor, which is located at the measurement location. Humidity is measured in the range from 1 to 35%. This is a good indicator. One set of batteries lasts for a long period.

Control Hydro Pro new

Advantages:

• low error;
• availability of a large number of options;
• measurements are carried out using a non-contact method;
• long service life;
• low electricity consumption.

Flaws:

• too much cost.

How to choose?

Weighing moisture meters can be used to study not only solids, but also air. Devices operating on this principle are accurate. However, they are used mainly in laboratories, since they require the use of other precision equipment. Hair instruments are suitable for working with gases, but they cannot be used to study solids and non-aqueous liquids. A conductometric moisture meter works simply and quickly, but it will not measure very low (less than 5%) humidity.

The needle device is not suitable for furniture and finishing wood. Scanning tips will leave ugly marks in the material. It is imperative to take into account the degree of error and the measurement range (the highest measured level).

Internal memory plays a very important role. Even non-specialists can benefit from comparing measurements taken at different times. The body of a good moisture meter is durable and lined with rubber. It is recommended to give preference to devices with batteries or a rechargeable battery rather than those with mains power. Of course, you should carefully study reviews about a specific model.

Megeon 20207

Megeon 20207

Country of origin: China. The electronic hygrometer has a wide LCD screen that is easy to visualize, on which all measurement indicators are simultaneously displayed. With this model you can measure relative humidity and temperature. There is a memory for storing previous measurements.

The model has a push-button control device, small size and light weight. The design is equipped with an alarm clock, clock and calendar. The model is intended for taking measurements at home and in office premises. Powered by AAA battery. Operating voltage 1.5 V. The device can operate in the temperature range from -50 to +70°C. This allows it to be used in unheated buildings. Measurement error +5%.

Advantages:

• compactness and light weight;
• economical power consumption;
• ease of operation;
• heat resistance.

Main disadvantage:

• high percentage of error.

Peculiarities

Everyone knows that wet objects and materials weigh much more than their dry counterparts. The traditional method of determining the degree of moisture is based on this - during the drying process, the material is weighed several times, the difference in mass provides the basis for calculating the level of moisture content in the object. Why is this method inconvenient? It requires too much time and extra effort.

Nowadays, compact devices - moisture meters (or hygrometers) - easily cope with this task. What are their advantages? Firstly, they make measurements easy and simple; they do not require bulky equipment or laboratory conditions. Secondly, you can choose the measuring location yourself - by the way, evenly dried wood is considered to be of the highest quality; the pattern of water distribution in the material can be determined only by several samples in different areas of the lumber. Thirdly, accessibility to a wide range of users and a variety of device types.

Challenges for measurers

In addition to different raw materials, these devices also perform different tasks, let's look at the most common tasks:

1. Quick approximate moisture check on boards without mechanical damage to the material;
2. Qualitative inspection of lumber;
3. Continuous monitoring of the drying process in drying chambers;
4. Inspection of hot lumber;
5. Quickly check the water content of hot and cold chips;
6. Flow control of hot chips;
7. In-line precise control of cooled chips.

And this is not the full range of products and tasks that measurers face. That is why there are so many different types of moisture meters and modifications. I propose now to consider all types of moisture meters and the tasks that each type performs.

Advantages of contactless devices

Such devices implement non-destructive analysis of the material, which is important in the examination of decorative wood panels. This method is achieved through sensors installed on the working part of the device. They replace the probes of contact models, but record data at a distance. Moreover, some representatives of this class provide scanning at a depth of up to 5 cm. It is advisable to use a non-contact wood moisture meter precisely in cases where the study of the lower threshold of values ​​is required. Also, the advantages of contactless devices include the ability to analyze the temperature and humidity of the air.

Price for moisture meters:

You can find out the price and how to buy humidity measuring instruments (moisture meters for wood, concrete and other moisture meters) by filling out a simple online application form or by phone

+7

You can get detailed information on the website: or by calling

We suggest that you familiarize yourself with the following sections:

Moisture meter for builders

Needle moisture meters

Merlin thermohygrometers

Advantages of use and types of moisture meters

The use of a compact device has its undeniable advantages, the main one being high quality analysis. Such devices are relatively inexpensive, and you will not experience any difficulties when handling them.

The moisture meter only requires a battery to operate.

What can be written down as a minus for him? Well, perhaps the need to make a small hole in the material being tested with a probe. This can be difficult if you are planning, for example, to check a finished product made of expensive wood. You will have to look for an inconspicuous place to conduct the analysis. Well, there is one more insignificant drawback - the device will not provide accurate information about humidity less than 4%. Although, if there is 4%, then this is a normal figure.

Moisture meters are available in different versions depending on the principle of analysis

Needle moisture meters for measuring wood moisture

Such devices are actively used in professional woodworking. Humidity measurement occurs in the thickness of the material at a depth of up to 4 cm. The operating range of the device is from 5 to 50%.

Needle Moisture Meter

Moisture meters for surface analysis

In such devices, the probes are short in length. These are compact devices for pocket carrying for household purposes. With their help it is easy to measure the moisture content of the board.

Probe penetration depth – up to 1 cm

Wood moisture meters for deep measurements

Deep instruments will show the condition of timber, logs and thick boards. They are also used to determine the moisture content of wood chips and sawdust used in the production of pressed boards. The main problem in using this professional device is the fragility of the long needle.

In order not to break the needle, certain skill is required during analysis.

Surface or dielectric moisture meters

Modern developments make it possible to study the moisture content in objects without violating their integrity. This is exactly how dielcometric moisture meters work. Non-contact wood moisture meters are simply placed on top of the product without damaging its integrity. This is very convenient if you need to analyze furniture or parquet made of expensive species.

A similar device can measure the moisture content of plywood and laminate

Hygrometer overview

Psychrometers for measuring the amount of moisture in wood are used when studying the material in laboratories, in woodworking shops and in the production of products. Large companies that are conscientious about their business carry out quality control of raw materials at all production stages . To do this, they use devices with certain characteristics from different brands.

Needle meters

• The EV 2K electric moisture meter (see photo) meets the requirements of GOST 22261-76 and GOST 24447-80. This is an industrial moisture meter designed to work with all types of lumber from different types of wood. The old-style conductometric model works using the contact method. Allows you to determine humidity at air temperatures of +5–400 ˚C. The average price of the device is 2000 rubles.

• Moisture meter KWB 0121-00 is a modern Chinese conductometric device. It is capable of measuring and analyzing the condition of wood, concrete and some other building materials. Its disadvantage is the low level of penetration into the material, which results in a high degree of error. Auto-shut-off feature when not in use extends battery life. Average price – 2000 rub.

• Gann needle wood moisture meters (Germany) are used in wood drying and storage shops. Different models take measurements at depths from 5 to 40 mm in the range from 5 to 50%. The choice of model is made based on the production needs of the enterprise. Price from 120 to 440 euros.

Non-contact devices

• Moisture meter for building materials VSM-1 is a universal tool for determining the level of water saturation in wood, stone, concrete during the construction process and during repair work. You can enter 25 graduated dependencies into the device, which will reduce the error in the result. The device is widely used in laboratory research. The average price of the device is high - about 35,000 rubles.

• The hydrocondtroleasy non-contact moisture meter is a domestically assembled device. Designed for quick measurement of moisture in lumber in accordance with GOST 16588. The device determines the amount of moisture inside large logs and beams along the entire length. Works with 7 groups of wood species. Given its versatility of use, an electric moisture meter is relatively inexpensive - from 5,800 rubles.

• Merlin instruments (Austria) are designed for measuring moisture in wood of different thicknesses: logs, boards, parquet, with planed and untreated surfaces. The choice of model should be made based on the thickness of the products being tested. The merlin HM8-WS25 meter can be called universal: the depth of the surface under study is up to 40 mm, the analysis spectrum is from 4 to 99%. A convenient touch screen and intuitive interface make using the device accessible to any controller. The cost of the moisture meter is 37,000 rubles.

• The micro hydro control device measures the moisture content of shallow layers and is used in the production of furniture, finishing materials made of wood, parquet, and solid doors. The device is capable of analyzing 23 types of wood . The compact dimensions of the moisture meter (see photo) and low price (about 3,000 rubles) are its main advantages.

• The MG4U wood moisture meter is a universal device for determining the condition of bulk and solid building materials. This is a moisture meter for sawdust, crushed stone and other bulk materials, as well as solid products. The software complies with GOST 21718 and GOST 16588. The device is included in the State Register. Price – about 43,000 rub.

• The MG4B device is equipped with 13 calibration curves for solid materials made of stone of different densities and 15 algorithms for wood. The characteristics are similar to MG4U, adapted for working with hard materials. Price 32,000 rub.

• ADA ZFM brand meters are designed for hard and soft wood, plasterboard, and brickwork. The working surface is on the back of the device. Measuring range – 0–100% humidity, measurement accuracy ±4%. The cost of the product is 2200 rubles.

Features of contact models

This is a traditional type of moisture meter, which is equipped with special needle probes that perform the measurement. The operating principle of such models is based on the conductometric method. That is, the calculation of indicators is carried out directly through the value of electrical resistance that occurs between the probes. During operation, a needle wood moisture meter is brought close to the object under study, after which the environmental data is analyzed. The information is then converted into percentage moisture content. The essence of this method is that the electrical resistance changes depending on humidity levels.

The advantages of contact devices include design simplicity, ease of setup and handling, as well as high measurement speed. On the other hand, wood moisture meters are not always accurate when working with material whose moisture content is up to 5%. Moreover, especially for wood, it is desirable that the probes be small.

Rating of the best paints for concrete

The German-Chinese moisture meter LASERLINER MoistureMaster Compact 082.333A is distinguished by its simplicity and reliability. Using this professional instrument, it is possible to determine humidity in different materials with high accuracy (0.2% error). Experts note a large measurement range (0-66.5%) and a wide range of applications.

Builders use the device to control the moisture level of cement screed, concrete, and gypsum plaster. For carpenters, the moisture meter is interesting because it stores 56 types of wood. For instant data processing and a 12-segment backlit indicator, the model takes first place in our rating.

Users praise the moisture meter for its high accuracy, rapid analysis and unpretentiousness. The only drawback is the high price.

The emergence of new building materials based on traditional synthetic and composite materials logically changes approaches to technologies for constructing houses and structures. And yet, no plastic can replace the unique qualities of wood. At least this applies to the combination of environmental friendliness, affordable price and decorative properties.

Physical characteristics are not among the strengths of this building material, which necessitates careful testing of the material before use. In assessing one of the key indicators of the condition of a structure, moisture meters for wood and lumber are used. As the name implies, such a device gives an idea of ​​the moisture level of the material, which, in turn, allows you to make decisions about further actions with the object being examined.

When choosing among manufacturers, it is advisable to turn to companies that specialize in the development of metrological equipment. The most respected brands in this family include Geo-Fennel, Testo and Condtrol. In the Wagner line you can find a good construction wood moisture meter. Reviews of devices from this manufacturer note not only the quality of the measurements themselves, but also the structural reliability. In terms of cost, budget contact devices are available for an average of 2-3 thousand rubles. Contactless analogues are estimated at 5-7 thousand.

Rating: 4.9

A deep matte surface can be created on the walls or ceiling of a room using Tikkurila Euro 3 Matt paint. The Finnish manufacturer sells a full range of colors in our country. Experts appreciated the exceptional wear resistance of the coating; it withstood more than 5,000 brush passes during testing.

Specialists are also delighted by the covering power of the material, so 1-2 layers are often enough to carry out the initial painting of concrete or to renew a previously painted surface. The paint's environmental friendliness and safety helped it become a winner in our rating, which makes it possible to decorate children's rooms and dining rooms.

User reviews are dominated by notes of praise. The advantages include moisture resistance, hiding power and ease of use.

Advantages

• high quality;
• ease of application;
• wear resistance;
• efficiency.

Flaws

Dufa Betoplast

Rating: 4.8

Dufa Betoplast paint allows you to combine several operations at once. The material impregnates, insulates, protects, fills and improves concrete and cement substrates. After drying, a durable coating is formed, which is highly resistant to mechanical, chemical and atmospheric influences.

Users have tested the paintwork in both homes and garages. It withstands temperature changes and mechanical stress, but is afraid of organic solvents.

Advantages

• multifunctionality;
• high adhesion;
• resistance to mechanical stress;
• elasticity.

Flaws

Rating: 4.7

Professional paint Dulux Bindo Facade BW is made on a latex basis. It is intended for the design of facades and plinths that have a mineral base. Experts note the successful combination of moisture resistance and vapor permeability, thanks to which an optimal microclimate is maintained in the house. The manufacturer has added biocidal additives to the composition; they reliably protect concrete or plaster from fungus and algae.

Russian painters praise Dulux Bindo Facade BW paint for its excellent coverage, good adhesion and quick drying. The disadvantages include the high price.

Advantages

• moisture resistance;
• vapor permeability;
• durability;
• excellent hiding power.

Flaws

Rating: 4.6

Teknos TEKNOFLOOR AQUA paint has been developed for finishing work inside buildings. This water-soluble acrylate-based material is used for painting both concrete surfaces and wood structures. At the same time, the manufacturer recommends adhering to several technologies (for new and old concrete floors, for new and old wooden floors). Experts gave Finnish paint fourth place in our ranking for its environmental friendliness and wide range of applications.

Read more: 7 best reels for ultralight

Among the advantages of the composition, painters note good coverage and excellent adhesion. Potential buyers are stopped from purchasing by the high price of paint. At the same time, the material does not have superpowers and requires gentle operating conditions.

Advantages

• environmental friendliness;
• wide scope of application;
• high quality;
• good adhesion.

Flaws

• high price;
• modest wear resistance.

Colorex Betopaint

Rating: 4.5

The Swedish façade paint Colorex Betopaint has unique properties. It combines hydrophobicity with high throughput. Thanks to this, aqueous solutions of salts that form in the plaster are removed. Experts appreciated the adhesive properties of the material and the resistance of the coating to weathering.

Few users have experienced in practice the capabilities of the paint and varnish material. The few reviews so far are positive.

Advantages

• water repellency;
• vapor permeability;
• reasonable price;
• environmental friendliness.

Flaws

• rarely used by Russian users.

Rating: 4.4

The Sherlastic Elastomeric coating stands out from its competitors due to its high flexibility. The American manufacturer supplies paint in 19-liter packaging, which is not always convenient for consumers. The product’s inclusion in the TOP 6 of our rating was ensured by the material’s excellent weather resistance and durability of the coating.

Users praise American paint for its good coverage, clogging of small defects in the base, and ease of application. The disadvantages include the high price and inconvenient packaging.

Advantages

• elastic coating;
• weather resistance;
• chemical resistance;
• elimination of base defects.

Flaws

• high price;
• inconvenient packaging.

Flugger Dekso 5

Rating: 4.3

Flugger Dekso 5 paint captivated our experts with its aesthetics and functionality. The acrylic-based water-based paint is used for finishing hotels, offices, and kitchens. The coating has a beautiful matte surface, it is water-repellent and wear-resistant. Thanks to its dirt-repellent ability, the painted surface remains perfectly clean for a long time. However, for this set of useful characteristics the consumer will have to pay a hefty sum. The composition is in seventh place in our ranking.

Users note the environmental friendliness of Danish paint, luxurious matte surface and excellent cleaning abilities. Craftsmen are satisfied with the covering power of the material and the ease of application.

Advantages

• beautiful matte finish;
• water- and dirt-repellent abilities;
• wear resistance;
• environmental friendliness.

Flaws

Rating: 4.2

Facade paint Tex Profi acrylate base D is a transparent dispersion. It is designed for painting concrete bases, plastered surfaces, and clay bricks. The material can also be applied to previously painted facades with a firmly adherent coating. The manufacturer sells the composition at the lowest price, which becomes an attractive factor when purchasing.

Domestic consumers speak flatteringly about the affordable price, smooth coating and good adhesion. But it should not be used in the kitchen because the coating will wear off with frequent washing.

Advantages

• ease of application;
• no odor;
• low price;
• good adhesion.

Flaws

• low abrasion resistance.

Attention! This rating is subjective in nature, is not an advertisement and does not serve as a purchase guide. Before purchasing, consultation with a specialist is required.

Overview of species

Currently, you can find several types of hygrometers (depending on the method for determining the level of water content in the material).

• Conductivity meter. Measures electrical conductivity and calculates the degree of humidity based on deviation from the standard.
• Dielmeter. Measures the dielectric constant and, based on the difference with the reference value, determines the water content.
• Infrared and microwave meters. In the first case, the degree of reflection of infrared rays is determined, in the second, the degree of absorption of high-frequency radiation. These types of hygrometers cannot be classified as compact products - they are installed permanently at large woodworking enterprises.

Needle-shaped

Another name for conductometers is needle moisture meters. They got it from two electrode needles that are dipped into wood to measure the current between them. The length of the needles can vary from 1.5 to 2.5 cm, the distance between them depends entirely on the manufacturer.

Contactless

Dielcometric or non-contact (induction) hygrometers work on a different principle - the test sample is placed in an artificially created EM field. This generates a high frequency electric current. Its strength depends on the humidity of the environment in which it is formed.

Comparison table of characteristics

For a more clear comparison of the models presented above, we have compiled a comparison table.

Basic selection options

The main characteristic of the device is the range of measured indicators. This is the range of humidity coefficients that the device will, in principle, be able to record. There are models that are capable of determining readings on a scale from 0 to 100%

But here it is important to understand that models with narrow ranges most often turn out to be more accurate and productive, since they are designed for a less extensive amount of data processing. In addition, the target material does not always require a wide range of examination.

This depends on the area in which you plan to use the wood moisture meter. How to choose a device based on this indicator? For lumber, for example, they are usually limited to a range from 1 to 45-50%. This “corridor” contains the optimal humidity for building materials. But for forestry workers who carry out taxation, it is important to have a universal model for recording extreme values. The error of the apparatus should also be taken into account. On average, it is in the range of 0.1-3.5%, but even in this case it is not always necessary to strive for the highest values. Accuracy up to 0.1-0.2% is usually required in highly specialized areas of construction or industry.

In soil, air and grain

Manufacturers present several more types of products. These are instruments that measure moisture in soil, air and grain. Most of these devices are quite expensive, but there are no complaints about their performance. The products are made of very high quality and will serve their owner for a long time.

LASERLINER MoistureMaster Compact 082.333A

A German-Chinese company has launched the production of simple and reliable moisture meters. The device is designed to measure parameters in different materials. The instrument error is only 0.2%. This is a very good indicator. Measurement interval from 0 to 66.5%. Users enjoy the wide reading range and versatility of applications.

In the construction industry, the product is used to measure the humidity parameter in gypsum plaster, concrete and cement screed. The device is also used in woodworking. It has its own flavor. Woodworkers are attracted to the moisture meter by the presence of 56 types of wood in its memory. The indicator consists of 12 segments. Data is processed very quickly, and the backlight will help you use the product in the dark. The model is in first place in the ranking. Users like the low accuracy, ease of use and unpretentiousness. The disadvantages include the high price.

LASERLINER MoistureMaster Compact 082.333A

Advantages:

• excellent quality;
• high measurement accuracy;
• multifunctionality;
• The device provides readings quickly.

Flaws:

• high cost.

Megeon 20540

The cost of the device is 6557 rubles. A universal device will help measure the amount of moisture in a standard and non-contact way. The device is used mainly for researching cereal crops. The product has an impressive size display, which is equipped with bright backlighting. Therefore, the tool can be used even at night. The device is multifunctional. The most useful options will be automatic shutdown, battery charge indication and storage of current measurements. The body of the product is made of durable material, so the device is resistant to minor shocks and falls.

Megeon 20540

Advantages:

• multifunctionality;
• wide backlit display;
• low error.

Flaws:

• Batteries have to be changed frequently.

CEM DT-172

The product is made in China. Products from this country are winning the market from their competitors every year. The device is popular due to its low price, light weight and compact size. The main advantage is that the moisture meter is included in the state register. Now you can carry out tool verification in special centers. Not every manufacturer can boast of such services.

Humidity is measured from 0 to 100%. The device can detect air temperature. It responds well to changes in humidity. The error of the device is about 3%. It is equipped with a USB output. Through the port you can transfer information to another medium.

CEM DT-172

Advantages:

• light weight and small dimensions;
• there is a certificate;
• verification can be carried out in a specialized center;
• low cost.

Flaws:

• relatively large error;
• runs on a rare type of battery that is difficult to buy.

How to use?

How to correctly measure the degree of dryness of wood and other materials using a moisture meter? Is it necessary to calibrate and configure the device during operation? How to correctly interpret different-sized device readings at different measurement locations? We will try to answer these questions. So how do you measure moisture with a needle moisture meter?

Mark several areas for measurements, immerse the electrodes of the device into the thickness of the wood and turn it on. The display should show the moisture content level. Perform similar actions on all selected places. As you can see, there is nothing complicated about this.

If you purchased a non-contact moisture meter, you can determine the moisture level of the wood as follows: place the sample within reach of the electromagnetic field that the device creates and wait a little. A microprocessor built inside the device will measure the strength of the high-frequency current that appears in the EM field and display the results on the display. Calibration of moisture meters is necessary if you measure the humidity of different materials with the same device. The technical data sheet and operating instructions provide tables for such measurements.

For information on how to choose the right moisture meter, see below.

How to use it correctly?

Despite the fact that these devices always come with instructions for proper use, some people cannot always correctly interpret the information described in the instructions for use. Now we will explain everything clearly to you.

Let's say you need to determine the moisture level of a parquet board. In this example, it is better to use a non-contact model; it will not harm the finished product. So, the measurement process goes like this:

1. The board itself is prepared (cleaned of debris, it is advisable to ensure a flat surface).
2. The device turns on (the button on the device itself).
3. The calibration is set (according to the table in the instructions).
4. The moisture meter is brought with the sensor side to the surface of the board or inserted into it.
5. The display shows the measurement results we need.

Photos of the best moisture meters for wood

Laserliner ClimaCheck 082.028A

Laserliner ClimaCheck 082.028A

The German brand is made in China. The electronic device is designed to measure temperature and relative humidity in domestic and office premises. The model is equipped with a convenient digital display. Temperature can be measured in C° or F°. The design has a convenient magnetic fastening. The humidity measurement range is from 20 to 99%. Measurement error +1%. The weight of the device is 180 grams.

Advantages:

• ease of operation;
• compactness and light weight;
• multifunctionality.

Main disadvantage:

• inconvenient narrow screen.

Best models

If you need to measure grain moisture, the Fauna-M model is suitable. This is a microprocessor device designed for oilseeds and grains. “Fauna-M” can be used during harvesting, and when monitoring the quality of harvested grain, and during storage, and during express analyzes during processing. The device operates in a dielectric method, and the measurement results are displayed on an alphanumeric display with backlight. There is a sensor that determines the temperature of the grains; There is also a setting that compensates for errors caused by temperature changes.

By adjusting the calibration of the device, you can adapt it to a specific type of grain crop. Even in the most difficult cases, the measurement error will not exceed 1.5%. The system is designed to work with:

• wheat;
• soybeans;
• peas;
• sunflower;
• rapeseed;
• triticale;
• mustard;
• flax;
• 8 more crops;
• optionally with chickpeas, safflower and other grain plants.

Testo 606-1 is a moisture meter for measuring the water content in wood and building materials. The model is included in the federal state register. Its memory contains characteristic curves for various types of controlled substances and wood species. You can successfully explore:

• beech;
• cement beacons;
• maple;
• concrete mixture;
• brickwork;
• pine;
• plaster;
• larch;
• mortar;
• spruce.

Thanks to the Hold option, reading measurements is simplified. The moisture meter from Testo lights up the screen and performs self-diagnosis if necessary. Other features worth noting:

• cover for protected storage;
• carrying strap;
• proprietary calibration protocol included;
• weight 0.09 kg;
• dimensions 0.119x0.046x0.025 m;
• error no more than 1%;
• measurement every second.

Condtrol Hydro-Tec is also an excellent moisture meter for working with wood and concrete. The device works very quickly. The design allows you to set the moisture content in the range of 2-65% in layers up to 0.02 m deep. The built-in sample library contains 20 types of wood, but not randomly, but divided into 9 groups. The manufacturer claims that Hydro-Tec is professional grade.

Therefore, it is readily used in woodworking, furniture, parquet, molding, window and door industries. The company warranty is given for 2 years. The device is included in the federal register. Requires a pair of AAA batteries to operate. The measurement takes no more than 1 second; and the relative air humidity during operation should not exceed 85%, permissible temperatures - 5-40 degrees above zero.

For wood and grain, Gann Hydromette Compact from Germany can be used. The German product can also work with sawn wood, fiber and particle boards no thicker than 0.025 m, gypsum and plaster. This needle-type moisture meter allows you to take into account the temperature of the material according to the table included in the delivery set. The moisture content of the plaster is indicated as a percentage of the dry mass. A 9 V dry cell or a rechargeable battery is used for power supply.

Combined

What are moisture meters used for?

Electronic moisture meters have come into use relatively recently. Before their invention, humidity levels were determined according to state standards. The research took a lot of time and required compromising the integrity of the samples. With the advent of electronic sensors, everything has become much simpler and faster: they measure the electrical resistance of a material and produce a result in a matter of seconds.

Electrical resistance depends on the amount of water in the wood

The moisture meter has an error of up to 4%, which should be taken into account if you are measuring, for example, a trunk. For accurate results, you need to take measurements in at least three places, at the ends and in the middle of the workpiece. It must be remembered that wood species have different densities. This factor can also affect the measurement error.

Video description

About the features of an electronic hygrometer, watch this video:
You need to buy a device taking into account the following parameters:

• Required level of measurement accuracy. Indicators may differ in models from different manufacturers. More modern and complex devices give accurate results, simple designs give approximate parameters. For home use, too precise instruments are not needed; approximate values ​​are sufficient.
• Location in the apartment. Not all devices can be mounted on the wall, but for the home this is the most convenient option used for control.
• Complete set of measuring instrument. The device for measuring relative air humidity must be complete with indicators and psychrometric tables. These elements indicate the high quality of the equipment.

There are many types of humidity meters Source infourok.ru
If difficulties arise, you can consult with the seller to select a device that meets all your needs and conditions. The cost of equipment depends on the brand and technical parameters. The most expensive devices with a wide range of values ​​and additional functions.

The heating threshold is taken into account if you plan to install the device in a bathhouse or sauna. For these locations, it must withstand temperatures up to 120 degrees.

Conclusions and useful video on the topic

The video will talk about the operating principles of stationary psychrometers and will compare the results obtained with the indicators of digital hygrometers:

Optimal air humidity in rooms reduces the risk of chronic diseases, alleviates the symptoms of existing bronchopulmonary diseases, and reduces the manifestation of allergic reactions.

The amount of moisture in the air affects a person’s performance, appearance and health. Therefore, measuring indoor water vapor should become a good habit in every family. .

Do you still have questions about choosing a hygrometer? Or would you like to add useful comments to our publication? Write your comments under this material.

If you have a hygrometer at home and want to talk about its pros and cons, write about it below the article.

How is air humidity measured?

You can find out the amount of moisture using available means: a lighted candle, a fir cone, a glass of water, or the condition of the leaves of a homemade moisture-loving plant. Such methods have been used for a long time, but they determine only approximate values.

Accurate readings can be obtained with a regular thermometer. This method is long and not very convenient, since it requires compliance with certain instructions, without which the data obtained will have a significant error.

Modern moisture meters are safe and fit harmoniously into the interior. Therefore, they can be used in any room to create a comfortable microclimate

To objectively measure water vapor in the air, special instruments are used that convert data on temperature and vapor concentration.

Such devices include:

1. Hygrometers.
2. Psychrometers.

Devices with different operating principles show values ​​with varying degrees of error. Some of the devices provide accurate data on the moisture content in the air, others allow for error.

There are instruments that record absolute values, and there are meters that reflect relative values. Therefore, before choosing a hygrometer, it is necessary to study the operating principle of the devices and take into account the conditions in which the device will be used.

The absolute value reflects the weight of water vapor in a cubic meter of air. The value is indicated in grams, kilograms per cubic meter. Such a value will not tell an ordinary person anything, so the unit of measurement is usually considered to be relative air humidity.

Relative humidity is the ratio of steam to air. The maximum possible amount of vapor in the air is 100%, the remaining values ​​are displayed relative to the maximum value.

To calculate the relative amount of moisture in the air, each device is equipped with a temperature sensor. Some devices broadcast additional temperature data, which is convenient since you don’t need to buy an additional thermometer

According to SNiP 2.04.05-91, relative air humidity should remain within 30-60%. In climatically humid areas, with outdoor vapor content greater than 75%, the values ​​will be slightly higher.