Cutting-Edge Hygrometer from Testo

Humidity Meter to meet the highest demands

Air humidity is one of the most important measurement parameters for a Hygrometer. Depending on the application, different performance requirements are made when it comes to a humidity meter. That is why Testo offers an unbeatable diversity of instruments: from the simple humidity meter, via Thermo hygrometer and multifunction measuring instruments, through to the humidity data logger with software.

Outstanding performance

Humidity measurement with Testo:

A Testo humidity meter offers you all-round outstanding quality:

  • Extremely long-term stability of Testo’s humidity sensor technology in every humidity meter.
  • Highly sensitive integrated or external probes for humidity measurement, even in complex environments.
  • Robust, compact housings with large, illuminated display.
  • Special technology for critical applications in industry, research or special high humidity areas.

What does a Testo humidity meter measure?

A humidity meter records the water vapour content of the air. The warmer the air, the more water vapour it can absorb before it becomes saturated and reaches maximum air humidity.

  • Relative humidity is the most commonly measured value. It indicates the air humidity present in the room in relation to the maximum air humidity. It is given in “percent relative humidity” (% RH). This means for example that the comfort level range is between 30% RH and 65% RH.
  • On the other hand, absolute air humidity indicates the quantity of water vapour in a sealed volume of 1 m³. It is expressed in grams per cubic meter (g/m³), for example to document the removal of humidity in drying processes.
  • The dewpoint is also an element of air humidity. It indicates the temperature to which the air has to be cooled for condensation to occur. If the process temperature for instance falls below the dewpoint, condensate develops.


Humidity Meter

Testo 623 – Thermohygrometer

  • Measures the temperature and humidity in the room and alerts the room’s occupants when thresholds are reached
  • Large, easy-to-read display: shows the current reading and provides you with an at-a-glance 90-day statistic snapshot

Details Here

Everything is Possible

Measure Air Humidity with Testo

Humidity Meter with Permanent Probes

Measure humidity and also calculates dewpoint and wet bulb temperature.

Shop Permenant Probes

Humidity Meter with Connectable Probes

Measure air humidity and other VAC parameters with just one instrument.

Shop Connectable Probes


Wide variety of external probes – for every application involving humidity measurement.

Shop All Probes

Infrared Thermometer with Humidity

With 4-point laser and 50:1 lens for measurement of humidity.

Shop Infrared Thermometer

Humidity Meter with App

Fast, digital, highly efficient and with an App.

Shop Smart Probes

More Efficiency Always Implies

The Right Humidity Meter

Comfort Level

Comfort Level

Mould Measurement

Mould Measurement

Dewpoint Calculation

Dewpoint Calculation


This is how to choose your ideal humidity meter

The requirements for humidity measurement vary no matter whether it involves air velocity & IAQ measurement or the cold chain, industrial moisture measurement, or cleanrooms.

Depending on the measuring task, either a conventional humidity meter or a complex system that handles critical applications effortlessly and reliably is the right one for you. So, the ideal humidity meter does not have to outclass absolutely every other one in technical terms. It needs to provide you with optimum support for your specific task:

  • Comfort level: Comfort level is an important parameter for setting heating and ventilation systems. Relative humidity and temperature are the crucial parameters for monitoring the thermal comfort level. In this respect, relative indoor humidity should range between 30% and 65%.
  • Mould detection: Mould is not always a consequence of structural damage, but can occur due to incorrect ventilation behaviour. Handy thermohygrometers or thermal imagers with a special humidity image measuring mode are suitable for mould measurement. With a humidity meter which calculates the dewpoint, you can also locate susceptible areas where there is a risk of condensation.
  • Long-term measurement: Where archiving, storage or comfort level are involved, humidity measurement over longer periods of time is of major importance. A Testo humidity data logger is ideal for long-term data measurement. This allows effortless handling of the high-precision, long-term measurement and documentation of air humidity values.
  • Material moisture: A Testo material moisture meter is very practical in terms of controlling storage and drying conditions. It measures the moisture of building materials and timber in a non-destructive way using thin, high-performance penetration needles. Special models also enable air humidity measurement. You can thus detect the causes quickly and thoroughly when humidity levels are too high.

Keep an Eye On

Air Humidity in Rooms

Air humidity in rooms

Expert Knowledge for Download

Air humidity in rooms

Expert Knowledge for Download

The air humidity in a room depends on several factors. It is important to keep an eye on the following elements in order to ensure optimum air humidity over the long term:

  • Production of humidity in the room, for example by the number of employees in an office.
  • Ventilation behavior: how often ventilation is used and how high the humidity and temperature of the circulating outside air are.
  • The ability of walls and furnishings to absorb humidity.
  • Transport of humidity by external building components.
Measuring Air Humidity

Tips for Even Greater Precision

A Testo humidity meter is easy to operate and highly precise. The following tips will enable you to get the best out of your humidity meter:

  • Adhere to the measuring distance from colder surfaces.
  • Set the probe up in the middle of the room at a height of about 60 cm.
  • Move the humidity meter gently to and fro during the measuring process in order to keep the acclimatization time as short as possible.
  • Do not breathe on the sensor. Warm breath can falsify the humidity measurement.

If Humidity Measurement is Not Everything

Further Moisture Meters by Testo

Temperature measurement with thermal imagers

In contrast to penetration thermometers, thermal imagers do not measure temperatures inside a measurement object, but on its surface. To do this, they measure the thermal radiation emanating from the object and convert it into a thermal image. Thermal anomalies can then be very quickly and clearly identified on this image. Thermal imagers are often used in preventive maintenance or in the construction industry to detect weak spots on systems or buildings.

Recording Temperatures

For many applications, it is not enough just to measure temperatures. The temperature must be recorded as a time progression, especially for the storage of sensitive goods, such as food. Temperature data loggers are suitable for this. Unobtrusively attached to the wall, they measure and document temperatures and other ambient conditions at freely selectable intervals.

Measuring Surface Temperatures

With temperature measuring strips and an appropriate surface temperature meter, you can quickly record the surface temperature of a measurement object. Ideal if direct contact with the object does not present a problem.

Smart, Non-Contact Measurement

Infrared thermometers are perfect for the non-contact measurement of temperatures from a distance. The Smart Probes are in turn available for a wide variety of measuring tasks. The main attraction for you: they are operated entirely via your smartphone/tablet and the testo Smart Probes App.


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