testo 623 – Thermohygrometer

testo 623 Thermohygrometer is a compact and elegant solution for monitoring indoor temperature and humidity. Designed for both desktop and wall-mounted use, it provides reliable, continuous data with a 90-day history display, making it perfect for offices, living spaces, and commercial facilities.”

SKU SKU-testo 623 Categories , Brand:

testo 623 is designed for the precise and reliable monitoring of indoor climate conditions. It features a versatile design suitable for placing on a desk or hanging on a wall. Users can customize measurement intervals from 5 minutes up to 24 hours, with automatic data logging for up to 90 days. The device also includes an Alarm function to alert users when readings exceed set limits.

Key Features:

  • Comprehensive Display: The large, easy-to-read screen shows current readings alongside time, date, and a 90-day statistical history. This allows for immediate analysis of long-term temperature and humidity trends without needing to connect to a computer.
  • Long-Term Accuracy: Equipped with a high-quality sensor known for its long-term stability, ensuring consistent and reliable measurements for years to come.
  • Elegant Design: With a sleek, digital photo frame aesthetic, the testo 623 fits perfectly into any environment. The package includes all necessary accessories for both table standing and wall mounting.
  • Continuous Reliability: Delivers high-quality measurement results continuously, thanks to its durable sensor technology.

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 ±3 %RH Remaining Range
±2 %RH + 1 Digit at +25 °C (10 to 90 %RH)
Resolution 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

Weight 240 g
Dimensions 185 x 105 x 36 mm
Operating temperature -10 to +60 °C
Measuring rate 20 s
Product-/housing material ABS
Protection class IP30
EU-/EG-guidelines 2004/108/EG
Battery type 4 x type AA batteries
Battery life 12 Months
Storage temperature -20 to +60 °C