Humidity, Products, Testo

Thermohygrometer – testo 625


The testo 625 compact thermohygrometer has a connectable humidity sensor which measures the air temperature and relative humidity. In addition, it also calculates the dew point and wet bulb temperature.The meter is equipped with a large, easy-to-read, backlit display, a hold function which allows you to freeze the last reading and min and max readings that can be displayed at the touch of a key.
In addition, the testo 625 has a battery-friendly power off mode and a long life moisture sensor which ensures best possible results for years to come. Wide range of accessories for even more features The testo 625 thermohygrometer is equipped with all the basic functions. You may, however, also individualize your thermohygrometer with one of the following accessories:
• Hand grip with sensor guide: simply remove the humidity sensor and connect the hand grip with sensor guide (optional) to get to hard-to-reach or otherwise inaccessible places
• Wireless hand grip: connect the humidity sensor to the wireless hand grip (optional) and equip your thermohygrometer with the wireless module (optional) to carry out wireless measurements. The measurements can be transmitted wireless from the sensor to the meter over a distance of up to 20 meters (in the open).
• Protection against dirt and shock: a carry case (optional) ensures that your meter and the sensors are safely stored away when not in use. The durable TopSafe protective case protects your meter effectively against dirt ingress and impact.

  • Measures air temperature and relative humidity
  • Calculates dew point and wet bulb temperature
  • Measures air temperature and relative humidity
  • Integrated long life moisture meter for long lasting quality
Delivery Scope

testo 625 thermohygrometer, connectable humidity sensor head, calibration protocol, batteries.


Download DataSheet Instruction Manual

Application Image

Technical Details

Temperature – NTC
Measuring range -10 to +60 °C
Accuracy ±0.5 °C
Resolution 0.1 °C

Temperature – TC Type K (NiCr-Ni)
Measuring range -200 to +1370 °C
Accuracy See probe data
Resolution 0.1 °C Radio probe

Humidity – Capacitive
Measuring range 0 to 100 %RH
Accuracy ±2.5 %RH (5 to 95 %RH)
Resolution 0.1 %RH

General technical data
Dimensions 182 x 64 x 40 mm
Operating temperature -20 to +50 °C
Housing ABS
Battery type 9V block battery, 6F22
Battery life 70 h (without radio operation)
Storage temperature -40 to +70 °C
Weight 195 g”