1. Home
  2. testo 623

testo 623 - Thermohygrometer

0560 6230
  • Measures the temperature and humidity in the room and alerts the room’s occupants when thresholds are reached
  • Large, easy-to-read display: shows the current reading and provides you with an at-a-glance 90-day statistic snapshot
  • Long-term stable sensor – for long-term, high-quality measurements
  • Table and wall mount included
  • The elegantly designed testo 623 thermohygrometer provides you with a quick and convenient means of measuring the temperature and humidity in offices, living spaces and commercial premises and logs the readings over a period of 90 days.

    The compact and elegant thermohygrometer is 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 thermohygrometer – technical features

    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.


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

    Temperature - NTC

    Measuring range
    -10 to +60 °C
    ±0.4 °C
    0.1 °C

    Humidity - Capacitive

    Measuring range
    0 to 100 %RH*
    ±3 %RH Remaining Range
    ±2 %RH + 1 Digit at +25 °C (10 to 90 %RH)
    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