• Humidity range: 0 to 100% RH
  • Humidity accuracy: ±2.5% RH
  • Humidity resolution: 0.1% RH
  • Temperature range: -10 to 60°C
  • Temperature accuracy: ±0.5°C
  • Temperature resolution: 0.1°C
  • Max./min./hold functions
  • 2 year guaranteed long-term stability


The Testo 625 thermo hygrometer is a compact, handheld instrument with a built-in humidity probe head for measuring humidity, wet bulb temperature, or dew point as well as temperature. Featuring a probe head that can be easily removed and attached to the handle via a probe cable or wireless transmitter, the Testo 625 thermo hygrometer is perfect for measuring air moisture in hard-to-reach areas.

The Testo 625 thermo hygrometer has a large 2 line display that includes min./max. values as well as a hold button to freeze readings. The Testo 625 thermo hygrometer measures humidity from 0 to 100% RH with an accuracy of ±2.5% and a resolution of 0.1%. Temperature readings from -10 to 60°C are accurate to ±0.5°C with a resolution of 0.1°C.


This product can be used in the following applications: