Digital Thermohygrometer – Testo 623

Model No: Testo 623Part No: 0560 6230

Testo 623 hygrometer for measuring the indoor air temperature and humidity in work places, offices, labs and logs the readings over a period of 90 days.

  1. Analysis of past temperature and humidity measurement values directly on site
  2. Histogram shows measurement values of last 90 days
  3. All important values at a glance
  4. Large, easily legible display


The compact and elegant hygrometer designed to grace any desk, table or wall and provides you with constantly reliable temperature and humidity readings in offices, living spaces or commercial premises.The testo 623 hygrometer – technical features
The testo 623 hygrometer is designed to monitor the indoor temperature and relative 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 aids you relying on your hygrometer for reliable readings for years to come.

Delivery Scope

testo 623 thermohygrometer, batteries, calibration protocol, wall and table mount.

Technical Data

Temperature – NTC
Measuring range -10 to +60 °C
Accuracy ±0.4 °C
Resolution 0.1 °C
Humidity – Capacitive
Measuring range 0 to 100 %RH*
Accuracy ±2 %RH + 1 Digit at +25 °C (10 to 90 %RH) ±3 %RH Remaining Range
Resolution 0.1 %RH
General technical data
Operating temperature -10 to +60 °C
Measuring rate 20 s
Protection class IP30
Battery type 4 x type AA batteries
Storage temperature -20 to +60 °C



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