How and how to measure indoor humidity: an overview of devices and the best ways

Device and principle of operation

The device consists of the following structural elements:

Basically, a moisture meter is a highly sensitive voltmeter. The principle of operation of the device is based on the fact that moisture conducts electricity, but dry wood does not. Therefore, if the wood fibers are saturated with water, the readings will be lower. If the material is absolutely dry, the resistance will be very high.

Unlike an ohmmeter, the device calculates the level of humidity. It processes the received resistance information and translates it into other numbers. For example, at the maximum parameter value (that is, if the tree is dry), zero will be displayed on the scoreboard.

How to Maintain Relative Humidity at Home

We have already decided how to measure the state of humidity in the room, it remains now to figure out how to restore the optimal level of humidity.

If the humidity is low

1. Ventilate the room. However, this method cannot always significantly improve the state of the home microclimate, since in summer the outdoor air can be dry.

   Also, when airing in the traditional way, dangerous microbes, allergens, dust, harmful gases and unpleasant odors can enter the apartment. But if you keep the windows constantly closed, then there is a high probability of encountering another problem of maintaining the microclimate - stuffiness (high levels of carbon dioxide).

   High-quality ventilation is also important when airing rooms. A valve can provide fresh air to the room, but it will not be enough to ventilate a room in which more than one person lives. The air passing through the supply and exhaust valve is not heated and is not cleaned.

   A breather will help you easily deal with stuffiness and not let dangerous “guests” from the street into the house. This is a supply ventilation device that takes air from the street, heats it, purifies it and supplies it to the room.

2. Wet clean regularly rooms.
3. Set up an aquarium at home. Keeping fish in an aquarium at home can also affect the humidity of the air.But remember that you need to take care of the fish and keep the aquarium clean.
4. Can be placed on window sills or near radiators containers with water.
5. Humidifier - a good option for the home. This device will cope with the dryness of home air, improve the microclimate and prevent the development of respiratory diseases.
6. Climatic equipment (air conditioner, breather, air purifier, Danfoss Eco thermostat) Complete with the MagicAir base station, it will help not only track the data on the state of the microclimate in the house, but also maintain optimal performance.

The base station collects information from room air about temperature, humidity and carbon dioxide concentration. All indicators are displayed on the smartphone screen in the MagicAir application.

If the humidity is high

The other side of the coin is too much moisture in the air.

1. Do not dry clothes in the apartment. The best thing to do is on the balcony.
2. After taking water procedures, when the humidity in the bathroom can reach up to 100%, need to ventilate. With high-quality ventilation, it will be enough to open the door to the bathroom and the window closest to the bathroom or turn on the breather.
3. You can buy special moisture absorption device. The principle of operation of this device is opposite to the process of air humidification: a built-in fan drives humid air through the device. An evaporator is also located inside, which turns moisture into condensate, which flows into a special container.

If you make a habit of constantly maintaining optimal air humidity at the required level, this will help reduce the risk of developing respiratory diseases and cases of allergic reactions.Normalized moisture favorably affects the skin, protects it from drying out and premature aging.

Comfort and fresh clean air to your home!

The norm of air humidity in the apartment

Recommended GOST 30494-96 air humidity in the room depending on the season:

• in winter - 30-45%;
• in the autumn-spring period - 30-45%;
• in summer - 30–60%.

The optimal humidity in the room for a person of different ages:

• for adults - from 40 to 60%;
• for children under 6 years old - 50-60%.

The ideal air humidity in an apartment for a person varies depending on the purpose of the room:

• in the bathroom, where the finish of the ceiling, walls and floor is usually resistant to water, the humidity can reach 60-70%;
• normal humidity in the rooms allocated for the kitchen, corridors, storerooms - 40-60%;
• in rooms where there are plants, the humidity should not be lower than 60–70%, for tropical and subtropical flowers - up to 80–95%, so it is recommended to take them out to the balcony, loggia or give them a separate room;
• it makes no sense to regulate humidity on a loggia or balcony, since this room is non-residential.

According to SanPiN 2.1.2.2645-10, relative humidity for rooms is enclosed in a more rigid framework and has values ​​of 60% in the cold season, and 65% in the summer. Some rooms are not standardized due to non-permanent or short stays in them, as well as frequent and long-term changes in humidity in these rooms

The name of a room	Air temperature, °C	Relative humidity, %
winter
Living room	18–24	60
A room in the areas of the coldest five-day period (minus 31 ° C and below)	20–24	60
Kitchen	18–26	N/N*
Toilet	18–26	N/N
Bathroom, combined bathroom. knot	18–26	N/N
Lobby	14–20	N/N
Storerooms	12–22	N/N
summer
Living room	20–28	65

* - not standardized

To increase the service life of household appliances, the safety of books, paintings, upholstery of upholstered furniture, the humidity level should not exceed 60-65%.

How to keep the optimal level of moisture?

The smartest way to maintain optimal humidity levels is to use a humidifier with a hygrometer. Thus, you can control and adjust the indicator to the desired value. In addition to humidifiers, the following measures will help increase humidity:

• Get an aquarium
• Put more flowerpots;
• Regularly carry out wet cleaning;
• Hang wet towels on batteries in winter;
• Put vessels with water on the battery, or arrange around the room;
• Leave the bathroom door open after hot water treatments.

To get rid of excessive moisture, you can use special devices like a dehumidifier or a moisture absorber. The exhaust system helps to get rid of warm, water-saturated air. For greater efficiency, a fan is used. On a sunny day, you need to open the curtains so that the rays dry the air in the room.

Ventilation is a must for maintaining optimal performance. Regardless of the weather, you need to regularly ventilate the apartment.

Ultrasonic Humidifiers

A special membrane is built into the device, which is responsible for converting water into steam. Such a device is less noisy than the previous options. The presence of an additional function of heating water in the process of turning into steam allows you to disinfect the air without any extra effort, getting rid of germs.

Such humidifiers work on distilled water, which is poured into tanks with special cleaning cartridges. Filters must be replaced regularly.

Important! When choosing a device, do not forget to take into account the area of ​​\u200b\u200bthe room where the use of a humidifier is meant. The device will be useless if placed in a room with an area larger than the recommended one and will not bring any benefit.

Themselves with mustaches

How to measure humidity if there is no device, and there is no need to buy it due to rare use? Ingenuity, the experience of generations, simple items that are in every home will come to the rescue.

Burn, burn my candle

Introducing an old-fashioned way to determine the humidity in a room. To do this, it is enough to make a moisture meter from a simple candle and a match. Before measuring air humidity:

• close the doors leading to adjacent rooms;
• ensure that there are no drafts;
• light a candle;
• watch the flames.

If the flame sways and the color of the halo is crimson, there is a lot of water vapor in the air. If the combustion is exactly vertical and the flame is orange-yellow, the presence of water vapor is normal.

Water, glass, refrigerator

This method makes it possible to measure the humidity of the air at home. This device has only three indications of the presence of moisture:

• excess;
• normal;
• inadequate.

Before checking the humidity in the apartment, pour plain cold tap water into a glass glass. Put in the refrigerator for 5-6 hours. The water temperature should be 6°C.

You can either measure with an outdoor thermometer or a bathroom thermometer.Then place the glass on the table in the room, at a distance of 1 meter from windows and walls. After 10 minutes, evaluate the result:

• condensate on the outer walls of the glass is concentrated in drops that flow onto the table - excess;
• the physical state of the condensate has not changed - normal;
• the condensate has evaporated or it has become significantly less - insufficient.

How to measure indoor air humidity?

Now it is not difficult to choose a device for measuring humidity. It remains only to know which one to give preference to. There are two definitions of humidity:

• relative;
• absolute.

The first indicator measures the amount of steam in 1 m3 of air, measured in grams and kilograms. The second indicator indicates the moisture content compared to the maximum amount in a state of thermodynamic equilibrium that can be in the substance. This humidity is measured as a percentage of the maximum value.

Most often, a hygrometer is used to measure humidity. Now there are many types of these devices, differing in different mechanisms of action. The device can have a mechanical and electronic display, be combined with a thermometer to determine the temperature in the room. It is desirable that the measurement error of the hygrometer is no more than 1%. Electronic devices are considered the most accurate, provided that they are installed away from air movement.

A psychrometer can determine very accurate relative humidity readings. The essence of his work is the difference between the temperature on two scales - dry and wet.It is not possible to quickly find out the result, since it is necessary to attach a wet cloth to it and after a while the psychrometer will be able to calculate the answer according to the special table with which it is equipped. Such a special device shows the most accurate parameters of air humidity.

Many people use a glass vessel for this purpose, although the exact parameters cannot be seen in this way. This method is good because every home has everything you need to measure humidity. You need to take a glass and fill it halfway with water, then put it in the refrigerator for several hours. To get more reliable indicators, the water temperature should be approximately 3-5 ° C. A glass of chilled water is placed away from the battery for 10 minutes. After 10 minutes, you can determine the humidity level.

If the condensation disappears completely after 10 minutes, then the air is very dry. In the case when condensate flows down the walls of the vessel, the air is too saturated with moisture. If the condensate has not dried up and does not drain, then the humidity level is optimal.

You can also use a regular thermometer and a damp cotton pad. It is necessary to remember the temperature on the thermometer, write it down and then attach an important cotton pad to the thermometer, tightly wrapping the base, after a while you need to record the temperature readings and calculate the humidity. To do this, you need to calculate the difference between temperatures and check with the Assman table. The resulting difference will indicate the moisture content.

Increasing and decreasing humidity

After measuring the humidity in the apartment, you can determine whether it is normal or not. If the level is low, then it must be increased using various devices and folk methods for this.

Humidifiers are commonly used.These devices are mainly designed for a room of 150 m2. They are of three types:

• traditional;
• steam;
• ultrasonic.

To correctly determine the choice of a humidifier, it is necessary to take into account the size of the room. The wrong choice can create conditions with increased moisture.

There are also folk ways to humidify the air in the apartment. For example, you can put wet things or water containers on batteries to get evaporation. Water containers are also placed on furniture and there it will not evaporate quickly. Houseplants have a positive effect on increasing moisture, moreover, if there are a lot of them in the house. After taking a bath or shower, it is not recommended to close the door for some time so that moisture spreads in the rooms.

If the apartment has an increased level of moisture, then you should drain it. There is a special device for this, it removes excess moisture. There are stationary and portable dehumidifiers. The principle of operation of the device is that it distills air through the "evaporator" and due to the temperature difference, condensate forms. Droplets of water flow into a specially provided container, and the air warms up again and returns to the room.

Moisture absorbers have also been invented, complete with special tablets. It absorbs moisture from the air. The device is very well suited for the autumn or spring season.

Popular methods for reducing the moisture in rooms include regular ventilation, exposure to more sunlight, and the use of an exhaust hood, for example, in a bathroom or toilet.

The issue of normalizing the level of moisture in the apartment should be taken seriously, otherwise high or low humidity can adversely affect the health of the whole family.

Ways to measure humidity at home

Before you know how to measure the humidity of the air, you need to consider the classification of moisture meters. The most common way to measure a parameter is to use hygrometers. They are classified according to the structure and principle of operation:

1. Weights, made from a system of mini pipes, with special substances that change the density depending on the saturation.
2. Hair determine the amount of moisture, using the properties of the hair to change its length in a humid environment.
3. Film - use film stretching in proportion to humidity.
4. Electrolytic, which determine the degree of dilution of the electrolyte on the glass. In this case, the indicators are taken by the internal device.
5. Electronic measure the optical and electrical parameters of the air.
6. Ceramic use the properties of changing the conductivity of the ceramic mass.
7. Psychometric - resemble a thermometer with an additional scale filled with a substance that changes temperature in proportion to humidity.

Special devices

Modern moisture meters are equipped with additional control options: atmospheric pressure and ambient temperature, they are called thermo-baro-hygrometers. When choosing a device, they prefer modern options, due to more accurate measurements, the permissible error of the device for serious control methods should be no more than 1%.

Household electrical hygrometers measure:

• Electrical conductivity of the ambient air;
• dew point using the optoelectronic method.

To work in them, microcircuits are installed, which minimizes measurement errors and significantly speeds up measurements with data transfer to the display.

Today, it is possible to measure the indicator using a phone on which a special application is installed or to set the humidity using an aspiration psychrometer, having received readings by the calculation method.

To do this, first determine the absolute humidity, and then the relative indicator.

Determination of absolute humidity: A \u003d H1 - a * (T1 - T2) * P.
Where:
A is the absolute value;
H1 is the saturation of the steam-water mixture according to the data of a wet thermometer;
a - psychometric indicator;
(T1 - T2) - temperature delta, which is determined between dry and wet thermometers;
P - air pressure on a barometer.

Relative humidity in the room (O) as a percentage is obtained by the formula: O \u003d A / H1 * 100,%

Measuring with a glass of water

This method is available to everyone who wants to measure humidity. Although it does not give a very accurate result, it guides the user on whether the controlled indicator is normal or not. To use it, you need an ordinary glass or flask, ordinary water and a household refrigerator.

Action algorithm:

1. Before measuring the air humidity in an apartment using this method, water is drawn into the flask and placed in a refrigerator (not a freezer) for 2-3 hours until the liquid cools to 3-4 C.
2. The vessel is transferred to a place for measurements, away from heating installations.
3. Examine the surface of the vessel.
4. If its walls are foggy, but dry after 10 minutes, the air in the room is dry, and if larger drops form, flowing down the glass, it is humid.
5. If during the specified period the condensate is in its original state, then the relative humidity corresponds to 45.0 to 55.0%.

Application of the thermometer

The measurement of humidity in the environment with a thermometer is carried out according to the principle of operation of a psychrometer using one of the properties of a liquid medium - evaporation. The temperature difference is indicated by two thermometers: dry and moistened, wrapped in wet calico immersed in water. Despite the simple principle of measurement, the method guarantees a fairly accurate result with deviations of no more than 2–3%.

When the liquid evaporates, it cools the humidified sensor and the less moisture in the environment, the lower its performance. Comparing the readings of both sensors, according to the above formula, absolute and relative humidity are obtained. To simplify the definition, you can use the table. At the intersection of the temperature data is the actual humidity.

A psychrometer is used to measure the humidity in a room.

Psychrometers are classified according to certain types:

1. Remote electrical or gauge, process data received from thermistors and thermocouples.
2. Meteorological stationary.
3. Aspiration with the use of a fan blown by thermometers located in a protective case.

What to look for when buying?

Indoor models of devices for measuring the amount of moisture in the air include mechanical and electronic hygrometers. They have a compact design, are safe for others and give a minimum error in the calculations. To maintain design ideas, modern devices have a concise design.

Criterion # 1 - the principle of operation

Mechanical and digital hygrometers have a number of advantages that may influence the choice of instrument.

The advantages of mechanical models of moisture meters include the fact that:

• the operation of the device does not depend on external power sources;
• they are easy to use, since minimal additional adjustment of the necessary operating parameters is required;
• the cost of a mechanical hygrometer is slightly lower than an electronic one.

Digital models come in the form of foldable, portable gadgets.

In addition, the advantages of electronic models include:

• high speed of issuing results;
• less error in readings, compared with a mechanical device;
• the output data is subject to further processing, due to the built-in internal memory.

Some electronic moisture meters combine several devices at once: hygrometer, clock, calendar, thermometer, barometer, dew point meter. Therefore, if the device performs several climatic functions, it is a stationary weather station.

Some moisture meters have a built-in alert system that is triggered when the steam level drops or rises to 30% and 60%. Such a device should be in homes where the climatic conditions of the region suggest high humidity or dry air.

For the comfort of the child and parents, the hygrometer can be built into the baby monitor. Such a device has great functionality and a warning system.

The latest models are equipped with a Wi-Fi module to display information about the weather in the region by receiving data via the Internet.

Modern models of hygrometers are designed for certain specifics of work, therefore, in order to accurately measure the air humidity in a room, apartment or other premises, it is necessary to understand how the device will be used. Then the purchased moisture meter will fully meet the necessary requirements.

Criterion #2 - Humidity Range

The optimum air humidity is determined by the purpose of the premises. In the bedrooms, the living room, the normal values ​​​​of the moisture meter are from 20 to 80%. Near the balcony, in the hall, attic and in the kitchen from 10 to 90%. For more information about the norms of air humidity in the apartment, we recommend that you read this material.

In damp rooms, the range of operating values ​​can reach 100%. The wider the range of values ​​captured by the device, the higher the price for it. Therefore, when choosing a gadget for bedrooms, a hall and an attic space, you can opt for devices with a small range of values.

When buying a hygrometer, study the operating characteristics indicated in the product data sheet

It is important that the parameters of the device include the upper values ​​of the range of expected operating temperatures. For some moisture meters, the maximum heating threshold is important

So, a device for a bath or sauna should include values ​​​​up to 120 ° C in the operating temperature range. Therefore, in rooms where temperature and humidity can reach quite high values, special devices for measuring vapors in the air should be purchased.

For some moisture meters, the maximum heating threshold is important. So, a device for a bath or sauna should include values ​​​​up to 120 ° C in the operating temperature range.Therefore, in rooms where temperature and humidity can reach quite high values, special devices for measuring vapors in the air should be purchased.

Criterion #3 - measurement accuracy

For the equipment of special storages, devices with the smallest error of indications are required.

So, in a home wine cellar, the humidity of the circulated air should be kept at the level of 65-75%, and the content of water vapor in the library should not be lower than 50 and higher than 60%.

Therefore, to measure the moisture in the air in such rooms, a psychrometer or high-precision electronic hygrometer should be used, which measures the amount of water vapor by changing the electrical conductivity of the air.

The error of the psychrometer ranges from 1 to 5%, the error of a digital device is from 5 to 10%. Therefore, they can be used in rooms where the air humidity must adhere to precisely set values.

If the humidity level does not meet the standards, but you need a device to increase it - a humidifier.

measuring device

Today there are several types of household device for measuring air humidity in rooms or apartments. How is air humidity measured in rooms and determined? Let's take a closer look at all types of hygrometers.

Thermohygrometer

Air humidity can be measured with a thermohygrometer. Let's take a look at his work. It has a complex system, so it determines not only the level of moisture, but also the temperature value inside the room. Also, in addition, this apparatus records the values ​​of the state of moisture and the temperature value at various points.That is, he compares the state of two indicators in the place where he is at this moment, and in the previous room.

The device for determining the humidity of the air synchronizes the values ​​that it received at various points in the building. According to these readings, the thermohygrometer gives a total result of the humidity and temperature values. What technical characteristics does it have?

Consider the technical characteristics of the thermohygrometer. The length of the wire is 150 centimeters. The readings are displayed as percentages, the range of which is from 0 to 90. You can also purchase models of thermo-hygrometers that are wireless in stores.

These models have an additional function: when the condition of the moisture level in the room is critical, the measuring device gives a signal that notifies the owner of a bad air situation. It is convenient to use this device (devices) or a meter, measuring the humidity in the apartment.

With this hygrometer, you can measure temperature and humidity. You will literally participate in changing the home "weather".

Psychrometer

This room apparatus is fully called a psychrometric hygrometer. How to determine the humidity in the apartment using a psychrometer? They have two thermometers. One thermometer is called "dry", which performs a standard job - measuring the temperature in the room.

The other thermometer is humid because it is inside a water vessel and is wrapped in a cloth wick. It gives an indication of the temperature of the wick, which is wet. The value of this temperature is obtained by evaporation of moisture. If the humidity indicator is low, then evaporation is carried out much faster.And vice versa.

Thanks to the psychrometer, you can get the necessary information about the state of your room, that is, determine the humidity of the air. Today, a psychrometer is often used to monitor moisture content.

Devices: hair and film

The hair device for measuring the humidity of the air in the room is quite easily arranged. Why is it called that? The work of this type of hygrometer is carried out on the basis of synthetic hair, which is defatted. How to find out the humidity of the air on it? How to measure the humidity in the apartment thanks to the hair device?

From a change in the state of the air, this synthetic fat-free hair also changes its length. It is stretched between the spring and the switch end. Due to the oscillation of the synthetic hair, the arrow moves along the plate with divisions (dial), which gives the general values ​​​​of the moisture level in the room. Let's discuss the "insides" of the device.

This air humidity meter has a large range of values ​​from 0 to 100. Therefore, the information about the state of the air flow will be the most accurate. Its main feature is the simplicity of its work. They are easy to handle, so you won't have to deal with it during use. This meter can be placed on the wall in the room - it's quite convenient. Measure and find out the data on the condition of the apartment, which will always be in front of your eyes.

There is another type of hygrometer - this is a film hygrometer. How to check the humidity in the apartment with it? The film hygrometer is different, therefore, the principle of operation is different from the hair hygrometer.The main distinguishing feature of a film hygrometer is the presence of an element that is sensitive. This component in the device is an organic film. The principle of operation - the organic film can stretch, or vice versa, shrink - it depends on the state of humidity in the house. The humidity value is also displayed on the dial.

If there are relatively low temperatures in a certain humid room, then it is recommended to use a hair or film hygrometer. Other devices are simply not suitable for determining the level of humidity in the room, they are practically not used.

What are hygrometers for?

A hygrometer is a laboratory equipment that measures the relative or absolute humidity of atmospheric air, gases. This device is also called a hygroscope.

Hygrometer in Greek, "ὑγρός" means "liquid", and "μετρέω" - "measure". Such a device will be useful both in everyday life and in the industrial field.

Humidity, like temperature, is an important indicator of the microclimate. It is recommended to maintain it within the limits of the standard: for each type of room, its own optimal level is set. It is useful for human health and the safety of things, structures, food.

From too humid air, fungus and viruses quickly spread, vegetables and fruits begin to rot, and mold appears on the walls. Condensation, settling on electrical equipment, metal structures, paper, leads to their damage. The chemical composition of drugs is also violated.

An overdried atmosphere worsens the protective properties of the nasopharyngeal mucosa. This leads to the fact that a person becomes susceptible to various viruses and infections.

Also, a low level of humidity has a bad effect on the quality and safety of food products: they begin to wither, lose their beneficial properties. The optimal microclimate is important during construction and repair work, especially if different solutions are used.

There are many types of hygrometers. Their accuracy may vary. The choice of device should be made based on the area in which it is planned to be used.

To maintain humidity at the desired level, it is necessary to measure it regularly and take appropriate measures if the indicator deviates from the norm.

The hygrometer is used in various fields:

• Food Industry;
• trade;
• animal husbandry;
• crop production;
• pharmaceutical industry;
• greenhouse, public utilities;
• construction, etc.

Despite their usefulness, hygrometers are not widely used in residential areas. They are usually used at weather stations and control services.

It is highly recommended to regularly measure the humidity level in hospitals, kindergartens and schools. It is worth buying such equipment for the home. Maintaining humidity in a given range, you can significantly improve all areas of your life.

Make your own psychrometer

To determine the humidity of the air, you can use an ordinary room mercury thermometer. With it, you can measure the humidity of the air psychrometrically. Before measuring the humidity in the room, prepare an ordinary rag and water.

The procedure for checking the presence of water vapor in the volume of air with your own hands is as follows:

• measure the air temperature in the room and write it down;
• wrap the mercury bulb of the thermometer with a damp cloth;
• wait 10 minutes;
• take and write down the thermometer readings;
• calculate the difference between dry and wet measurements;
• download the psychrometric table;
• find the humidity level in the room.

Such an air humidity meter does not take up much space, does not require additional costs, and provides the necessary measurement accuracy.

How to measure humidity

Relative humidity in the room is measured using special instruments - hygrometers. They have a different design and principle of operation:

1. Electronic. Usually combined with thermometers to simultaneously measure the temperature in the room. In them, a thin layer of electrolyte is applied to the inner plate, through which the voltage passes. The results are displayed on the dashboard.
2. Mechanical. Cheaper and easier-to-use devices, however, can give a measurement error of up to 8%. They work without a power supply, are available as desktop or wall-mounted. They do not have a digital display, they are equipped with a dial and an arrow.

There are several ways to determine the saturation of air with moisture, not all of them are popular, but there are:

1. Weighted or absolute. It is a device that determines relative humidity by absorbing it. With the help of special tubes with a chemical composition, he takes measurements. Do not use at home.
2. Hair. This type of hygrometer is used only in laboratories, and then only because its principle of operation is based on the study of a human hair.
3. Film. It also belongs to the category of laboratory instruments. The main mechanism is a special film, which, depending on the level of humidity, is stretched or, conversely, compressed.It is most effective to use it in the winter season.
4. Electronic. This type of device is most often purchased for household measurements of humidity. Using it is quite simple, as the mechanism immediately displays the final measurement result on the touch screen.
5. Psychometric. The most accurate type of moisture meter. Often it is purchased for work in industrial, laboratory premises. Also, many "civilian" users leave their choice on psychometric hygrometers because of their relatively low cost and extreme accuracy.

To determine the norm of air humidity in an apartment, an inexpensive mechanical hygrometer is suitable. For domestic use, certification in the metrological service is not required.

It is important to pay attention to the temperature range of use - the maximum value is 80-120 degrees. When using in a sauna or bath, you must choose the extreme option

Determination of humidity without devices

You can independently find out quite accurately the humidity in the room without having instruments. There are two options for this.

When measuring in the first way, you need to measure the air temperature in the room with a thermometer and record the readings. Then take a small piece of a cloth or bandage, wet it and wrapping the tip of the thermometer, leave it for 5 minutes.

Psychometric table for determining the relative humidity of the air

In the second case, you need to pour a glass of water and cool it in the refrigerator to + 3 ... + 5 ° C. After that, transfer the glass to a room away from heating appliances and leave for 10 minutes. We look at the glass if:

• The glass is dry. The humidity in the room is insufficient.
• There is condensation on the walls. Humidity is fine.
• Lots of condensation and leaks. The humidity is too high.

Increased condensation on a glass with drips indicates high humidity