Testo 623 thermohygrometer with measurement history function

The testo 623 thermohygrometer is designed to monitor the indoor temperature and humidity accurately and reliably. User-defined settings allow you to determine the length of the intervals between measurements – from 5 minutes to 24 hours. The readings are saved automatically over a period of 90 days and an alarm alerts the room’s occupants when a threshold has been reached.

The large, easy-to-read display shows a variety of information including the last reading, the time and date and a 90-day statistic. This statistic allows you to carry out a long-term analysis of the indoor temperature or humidity of the room without first having to access your computer.

The long-term stable sensor guarantees long-term, high-quality readings. You know you can rely on your meter to provide you with reliable readings for years to come.

The elegantly designed testo 623 thermohygrometer fits seamlessly into any environment. It can be placed on a desk or table like a digital photo frame or fixed to a wall. A table and wall mount are both included.

  • The hanging or placing holder allows for flexible placement of the measuring devices: on the wall or on the desk
  • All relevant values immediately available: current and saved temperature and humidity as well as date and time
  • Large, easy to read display
  • Precise measurement of temperature, humidity and pressure

Delivery range: testo 623 thermohygrometer, wall or desk mount, batteries and factory calibration certificate.

Technical data:

Humidity - Capacitive

Measuring range

0 to 100 %RH*


±2 %RH + 1 Digit at +25 °C (10 to 90 %RH)

±3 %RH Remaining Range


0.1 %RH

* Not for condensing atmospheres. For continous use in high humidity (>80 %RH at ≤30°C for >12 h, >60 %RH at >30°C for 12 h), please contact us via our website. Please see the additional accuracy information for humidity in the instruction manual.

General technical data


240 g


185 x 105 x 36 mm

Operating temperature

-10 to +60 °C

Measuring rate

20 s

Product-/housing material


Protection class




Battery type

4 x type AA batteries

Battery life

12 Months

Storage temperature

-20 to +60 °C

Temperature - NTC

Measuring range

-10 to +60 °C


±0.4 °C


0.1 °C

0560 6230

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