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Extech RH35: Desktop Hygro-Thermometer Alert

Monitors Humidity, Temperature, and Dew Point for the previous 24 hours

Extech’s RH35 monitors Humidity, Temperature, and Dew Point for the previous 24 hours and alerts users to indoor mold hazard conditions starting with a frown icon warning when humidity reaches 60%RH. When the RH exceeds 65%, a loud audible alarm and bright flashing red LED will be triggered. The frown icon will also appear if the environment is too dry (<40%RH) where static electricity becomes a concern. The RH35 is perfect for commercial, retail and residential sites prone to mold. Complete with stand and 2 AAA batteries.



  • Innovative graphical display shows the measured humidity values of the last 24 hours like a radar screen
  • Large, easy-to-read LCD displays % Relative Humidity, Indoor Temperature and Dew Point
  • Humidity range: 10 to 99%RH
  • Temperature range: 14 to 140°F (-10 to 60°C)
  • Beeper sounds and bright LED flashes when humidity level exceeds 65%RH
  • Facial icons indicate comfort and uncomfortable RH zones
  • Stores and recalls Max/Min readings
  • Complete with stand and 2 AAA batteries


Specifications Range
Temperature Range ‐10°C to 60°C (14°F to 140°F)
Temperature Accuracy ±1°C (±1.8°F) from 0 to 50°C (32 to 122°F), otherwise ±1.5°C (2.7°F)
Relative Humidity Range 10 to 99%
RH Accuracy ±4% from 30% to 80RH%, otherwise ±5%
Batteries Batteries 2 x 1.5V AAA
Dimensions 98 x 23 [50] x 98 mm (3.86 x 0.91 [2.04] x 3.86in.)
Weight 87g (3.1oz.)