Hygrometer comparison 2018

Purchase advice on hygrometer comparison or test 2018

  • A hygrometer is a device with which you can measure and display the humidity in rooms. This is especially important to prevent mold growth.
  • For the measurement of the relative humidity different methods can be used, whereby most often the so-called absorption method is used.
  • In addition to analog, mechanical hygrometers, there are also electronic hygrometers, which have a digital display and do not need to be calibrated. When selecting the right hygrometer, you should always consider criteria such as measuring ranges or operating mode.

Hygrometer comparison 2018: hygrometer

Mold in living rooms is no longer a rarity. Already in 2011, 17 percent of respondents in Germany, already once mold damage to have noticed in her home. In addition to structural defects is often poor ventilation behavior of the reason. For example, according to the Austrian Institute for Building and Ecology (IBO), a four-person household produces between five and 10 liters of water vapor per day. These excess moisture must be removed in principle by airing.

However, in order to recognize a mold danger in time and to warn against too high humidity, it is worthwhile Purchase of a hygrometer, We would like to explain to you in detail in our Hygrometer Test 2018 which advantages the use of so-called hygrometers has and how these can be differentiated. In addition, we present in our purchase advice various criteria that you should consider when purchasing a hygrometer.

1. What is a hygrometer?

Historical background

The first attempts to measure the humidity of the air were already found in the middle age instead of. The first right one hygrometer has been 1783 constructed by Swiss naturalist Horace-Bénédict de Saussure with the help of a blond woman's hair.

A hygrometer is a gaugewith which the Humidity determined can be. The term is derived from the Greek word "hygros", which means "wet" or "wet".

Humidity refers to the proportion of water vapor in our ambient air, which in turn depends on the air temperature.

Before we go into the following on the specific hygrometer types and their functions, we would like to know more about the Benefit of a hygrometer and the Conditions for a good indoor climate inform.

By the way: Do not confuse the hygrometer with the hydrometer, The latter is a device for measuring the speed of running water.

1.1. need

To have a healthy living environment, the Humidity in the room neither too high nor too low be otherwise, for example, mold or respiratory diseases can be favored. Especially in the kitchen or bathroom, the corresponding values ​​are often in elevated areas, which is why these rooms should be ventilated especially regularly.

test.de expert Michael Koswig recommends: It is best to open the windows throughout the apartment for 5 to 10 minutes in order to generate as effective aeration as possible.

If more than 80% humidity prevails in a room over a longer period of time, this will inevitably lead to the development of mold, and some types of mold even multiply as low as 70%.

Not only the Moisturizing of humans and pets contributes to this, even indoor plants can increase these values, for example. So that Humidity monitored Therefore, should be in living rooms hygrometer be installed.

1.2. Determine relative humidity

For a comfortable indoor climate with the hygrometer the relative humidity displayed. This designates that Ratio of the maximum possible amount of water to the actually contained water vapor in the air. If the relative humidity is 100 percent, this means that the air has absorbed the maximum possible amount of moisture.

This maximum amount of water vapor depends on the temperature from. A pleasant living climate is generally a room temperature of 19 to 22° C and a corresponding relative humidity between 40 and 60 percent. The higher the temperature of the air, the more moisture (in the form of water vapor) it can absorb.

The following table shows the temperature at which Air per cubic meter how much moisture can absorb:

temperaturemoisture absorption
- 7° Capproximately 2.2 g Water per cubic meter of air
0° Capproximately 4.4 g Water per cubic meter of air
+ 10° Capproximately 8.8 g Water per cubic meter of air
+ 15° Capproximately 11.0 g Water per cubic meter of air
+ 20° Capproximately 17.0 g Water per cubic meter of air
+ 23° Capproximately 20.0 g Water per cubic meter of air

In this context, the relative humidity is also saturation called.

2. Hygrometer types: This is how humidity can be measured

To measure the humidity, there is several methods, We would like to briefly introduce you to the most common options in our hygrometer test.

2.1. Hair hygrometer and absorption method

Hygrometer comparison 2018: 2018

Hair hygrometer with thermometer by Fischer in a stylish stainless steel case.

When so-called. Hair hygrometer changes with the moisture the length of the hair. Hair is one of the hygroscopic substances, i. e. Substances that hygroscopic and absorbing, including the absorption of water vapor from the air.

The lower the humidity, the more the hair contracts. Human hair is used in a classical manner preferred because they have particularly stable properties. The respective change in length is transferred to a pointer, which in turn indicates the corresponding degree of saturation on a scale. This variant is called absorption method designated.

In addition to human hair hygrometers, synthetic materials such as synthetic fibers or rolled bimetal strips are also used as absorption hygrometers. The hair hygrometer is the most commonly used addition to modern digital hygrometers Form for determining the humidity in private use.

Attention: While synthetic fibers have similar good humidity-measuring properties as human hair Hygrometer with bimetallic strip clearly inaccurate, Very subtle changes can not accurately register them.

2.2. Electronic absorption hygrometer

Hygrometer comparison 2018: 2018

Digital thermo-hygrometer of the brand TFA in a modern design.

Unlike the hair hygrometer, electronic hygrometers have one sensorwhich responds to the corresponding changes in humidity. Ultimately, the change in the electrical resistance or the electrical capacity as a function of the humidity is measured. Usually, capacitive sensors or impedance sensors are installed.

Decisive for the user is that electronic thermo-hygrometer usually a Digital display own and are quite reliable. The devices do not need to be calibrated, but you will need it batteriesto work. Radio-hygrometer send over a wireless transmission also external values ​​over several transmitters up to 100 m.

2.3. psychrometer

The relative humidity can also be determined with a so-called psychrometer (derived from Greek "psychrós": frosty, cold). This consists of two thermometers: One is surrounded by a wet flow, so that it cools due to the passing air due to evaporation. The displayed temperature drops so by the evaporative cooling.

The second thermometer is there for that ambient temperature display. As a measure of the relative humidity is ultimately the Difference between the two determined values, i. e. If both thermometers show the same temperature, the humidity in the air is 100 percent.

Although this method is very reliable, so too very expensive, Therefore, psychrometers are primarily used by professionals and are less suitable for home use.

2.4. Taupunktmethode

Hygrometers usually have a mirrored surface for the dew-point method, which is cooled down in the air until water is deposited on it. As a measure of the humidity is used in the Difference between mirror temperature and air temperature.

This method is also not recommended for private use and is generally only used in laboratories.

3. Purchase criteria for hygrometer: You must pay attention to this

If you want to buy a hygrometer, there are a few factors that you should consider before purchasing. In our hygrometer comparison 2018 we present you the most important purchase criteria before and will help you in choosing the right meter for you.

3.1. Mechanical or electronic?

Especially practical:
Hygrometer App

For all smartphone users, there are now also a variety of hygrometer apps. These GPS tracking weather apps combine functions of hygrometers, thermometers and even barometers, such as the "Thermo-Hygrometer" -App.

As already evident from the different hygrometer types, the appliances used in the household are based on either a mechanical or an electronic method. That is why there are often differences between the categories Digital hygrometer and analog hygrometer.

Mechanical, analogue measuring instruments are based on either natural hair, synthetic fibers or metal spirals. Electronic, digital devices are often complete hygrometer weather stations, as they can often display temperature as well as additional weather conditions in addition to humidity. That is why the term is often used in commerce Thermo-hygrometer.

Below we have the once Advantages and disadvantages of an electronic hygrometer compared to a mechanical summarized:

  • usually work more accurately
  • do not have to be adjusted
  • digital display simplifies reading
  • often indicate additional weather conditions
  • react relatively sluggish - change of location slows down correct display
  • Batteries necessary
  • often more expensive than mechanical hygrometers

Tip: As the price increases, electronic hygrometers typically increase accuracy, while shortening the response time in parallel. Conversely, not every cheap hygrometer needs to work unreliably.

3.2. measuring ranges

In general, manufacturers for their humidity meters, whether analog hygrometer or electro-hygrometer, one Temperature measuring range as well as one Humidity measurement range on. The specified temperature range should in any case match the circumstances and circumstances of the location where the hygrometer is to be used. If you would like to use the meter outdoors, for example, the hygrometer should also be able to display temperatures below 0° C.

Therefore, the general rule is: the larger the respective measuring range, the more flexible you are in terms of the place of use.

Most hygrometers have one Temperature range of 0 to + 50° C, some even from -10 to + 60° C. The indication of the humidity in the room is always in percent. An ideal humidity measurement range includes 0 to 100%, but many devices limit themselves to only one Display range of 20 to 95% humidity.

3.3. Size, weight and operation

Hygrometer comparison 2018: hygrometer

The digital hygrometer from TFA Dostmann sends an optical signal at the risk of mold.

Of course, your hygrometer should be placed as inconspicuously as possible in the rooms and still have one large, easy-to-read display feature. As far as the size of each device is concerned, the differences are minimal. However, the particular display can vary greatly between analog and digital hygrometers in particular.

Especially electronic measuring devices often have a very good display, which is over optical extras such as smileys, dew-point indicators, or light-up annunciators. Some models, especially digital weather stations, even send one if there is a risk of mold acoustic alarm, which is usually manually switched off. Mechanical hygrometers often work with for simplified representation colored comfort zones.

Hygrometers are general very easy and can usually either hang on the wall or set up. For the latter, many models have one removable stand, Depending on if the hygrometer operated with batteries or not, its weight is on average between 25 and 100 g.

4. Questions and answers about hygrometers

4.1. Which hygrometer measures exactly?

Digital hygrometers measure in general very reliable and exactly, however, its measuring accuracy can decrease over the years. Also mechanical hygrometer can fully serve their purpose if they adjusted correctly are. Even if Hygrometers from Humidor have a very good reputation, the measuring accuracy depends neither on the brand nor on the type of hygrometer.

So that these do not show wrong values, you should not rely only on the one-time calibration of the manufacturer. Oak (analogue) hygrometers that work mechanically, ideally every four to six months, and after each transport, to obtain very accurate readings.

4.2. How can I calibrate a hygrometer?

Hygrometer comparison 2018: comparison

Thermo-hygrometer from Lantelme with adjusting screw for correct adjustment.

To calibrate a hygrometer, it is often sufficient to use the device for about to wrap for one hour in a damp, lukewarm cloth, Thereafter, the device should display at least 95 percent humidity. Make sure that while calibrating the hygrometer in this way, the room temperature is constant and you are in a draft-free, closed room.

Of course, there are other ways to calibrate an analog hygrometer. Some devices have one on the back adjustmentwith which hygrometers and thermometers can be additionally adjusted. Another method is the salt method, which is illustrated in more detail in this video:

4.3. What does Stiftung Warentest say?

The Stiftung Warentest already compared different measuring devices in 2003 - among others from the brands Conrad, TFA and Fischer - and searched for a hygrometer test winner. Have along especially digital devices cut very wellwhile the Foundation also regards the mechanical hygrometer Importance of calibration emphasized.

Since the test is already a few years back, you can find even more up-to-date models and more modern devices in our buying guide.

4.4. Where should a hygrometer be set up?

Hygrometer comparison 2018: hygrometer

An analog hygrometer hangs on the living room wall.

Generally, manufacturers recommend in every room to set up a hygrometer. Especially when many people live in a small apartment or you own a ground floor apartment, the mold risk is increased. In Kitchen or bath In addition, the humidity is usually a bit higher, which is why you should pay particular attention to allow the steam to escape to the outside regularly. The additional purchase of a hygrometer is not expensive and helps you to effectively control the humidity in the rooms.

Even the best hygrometer will only provide accurate values ​​if the site is chosen deftly. Ideally, the thermo-hygrometer - whether digital or analog - should neither too close to an outer wall, nor near a window or a door.

It is best to check the humidity several times a day. Depending on the site we recommend:

  • Bathroom: before and after every shower
  • Kitchen: before and after cooking
  • Bedroom: before going to bed and immediately after getting up
  • Study: at the beginning of work, while working at the computer and before leaving the room

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Video Board: Top 10 Hygrometers [2018]: ThermoPro TP55 Digital Thermo-hygrometer with Larger Backlit Display,