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Testo 625 Thermohygrometer

testo 625 Thermohygrometer key features :

The testo 625 thermohygrometer comes into its own in all situations where the right indoor climate is crucial, for example in archives, storerooms, greenhouses, and buildings. The testo 625 hygrometer also calculates the dew point and wet bulb temperature quickly and accurately.

(1 customer review)

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Testo 625 Thermohygrometer

Order-Nr.  0563 6251

The Testo 625 compact thermohygrometer has a connectable humidity sensor that measures the air temperature and relative humidity. It can also calculate the dew point and wet bulb temperature.

The meter is equipped with a large, easy-to-read, backlit display, a hold function that 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 thermo hygrometer has a battery-friendly power-off mode and a long-life moisture sensor to ensure the 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, wish to 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 the 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 wirelessly 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.

Testo 625 Thermohygrometer specification:

  • Dimensions : 182 x 64 x 40 mm
  • Operating temperature: -20 to +50 °C
  • Battery type : 9V block battery, 6F22
  • Battery life: 70 h (without radio operation)
  • Storage temperature: -40 to +70 °C
  • Weight: 195 g
  • Measuring range Humidity – Capacitive : 0 to 100 %RH
  • Accuracy Humidity – Capacitive: ±2.5 %RH (5 to 95 %RH)
  • Resolution Humidity – Capacitive: 0.1 %RH
  • Measuring range Temperature – TC Type K: -200 to +1370 °C
  • Resolution Temperature – TC Type K: 0.1 °C
  • Measuring range Temperature – NTC: -10 to +60 °C
  • Accuracy Temperature – NTC: ±0.5 °C
  • Resolution Temperature – NTC: 0.1 °C
  • for more details visit the Testo 625 datasheet.

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1 review

1 review for Testo 625 Thermohygrometer

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  1. Carson

    I have always loved testo products

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Testo is a world leader in the design, development, and manufacture of portable test and measurement instrumentation and solutions. Backed by 60 years of measuring engineering experience, our mission is to provide the best quality, service, and value in the industry. In addition, Testo is recognized as the leading worldwide manufacturer of portable combustion efficiency analyzers and air emission analyzers. Testo has become a major supplier of HVAC, critical HVAC, refrigeration, airflow, and environmental monitoring instruments for markets as diverse as chemical, food service and production, pharmaceutical and biotechnology, and residential HVAC suppliers.

Data Sheet

Data Sheet




Humidity Measuring (Range/Resolution/Accuracy)

0 to +100 %RH/0.1 %RH/±2.5 %RH(+5 to +95 %RH)


-10 to +60 °C/0.1 °C/±0.5 °C

Temperature Sensor

Type K (NiCr-Ni)

Mechanical and General Specifications

182 x 64 x 40 mm


195 g


6F22, 9V block battery

Operating temperature

-20 to +50 °C

Storage temperature

-40 to +70 °C