1. Home
  2. testo 623

testo 623 - Thermohygrometer

0560 6230
  • Measures room temperature / humidity / alerts the occupants when thresholds are reached
  • Large, easy to read display / shows current reading / provides at-a-glance 90-day statistic snapshot
  • Long term stable sensor for long term / high quality readings
  • Table and wall mount included
  • The elegantly designed testo 623 thermohygrometer measures the temperature and humidity in offices, living spaces, and commercial premises, and logs the readings for 90 days.
    The compact and elegant testo 623 is designed to grace any desk, table, or wall, and provide reliable temperature and humidity readings in offices, living spaces, and commercial premises.

    The testo 623 thermohygrometer – technical features

    The testo 623 thermohygrometer measures the indoor temperature and humidity accurately and reliably. User-defined settings allow you to determine the length of the intervals – from 5 minutes to 24 hours. The readings are saved for 90 days, and an alarm warns when thresholds are reached.
    The large, easy to read display shows the last reading, time, and date, and a 90-day statistic, which allows you to carry out a long-term analysis of the indoor temperature or humidity without accessing your PC.
    The testo 623 thermohygrometer has a long term stable sensor that guarantees long term, high quality readings, and is elegantly designed to fit seamlessly into any environment. It can be placed on a desk or table like a photo frame, or fixed to a wall. A table and wall mount are both included.

    testo 623 thermohygrometer, batteries, calibration certificate, and table and wall mount

    Temperature - NTC

    Measuring range
    14° to 140 °F / -10 to +60 °C
    ±0.7 °F / ±0.4 °C
    0.1 °F / 0.1 °C

    Humidity - Capacitive

    Measuring range
    0 to 100 %rH*
    ±3 %rH Remaining Range
    ±2 %rH + 1 Digit at +77 °F (10 to 90 %rH) / ±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

    8 oz. / 240 g
    7 x 4 x 1 in. / 185 x 105 x 36 mm
    Operating temperature
    14° to 140 °F / -10 to +60 °C
    Measuring rate
    20 sec
    Protection class
    Battery type
    4 x AA batteries
    Battery life
    12 Months
    Storage temperature
    -4° to 140 °F / -20 to +60 °C