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Extech Desktop Hygro-Thermometer Alert - RH35

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Extech Desktop Hygro-Thermometer Alert - RH35


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Extech Desktop Hygro-Thermometer Alert - RH35

Extech Desktop Hygro-Thermometer Alert - RH35



RH35 Desktop Hygro-Thermometer Alert by Extech

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.


  • 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
  • Measurement ranges: Humidity: 10 to 99%RH; Temperature: 14 to 140°F (-10 to 60°C)
  • Basic Accuracy of ±4%RH (30% to 80%), ±5%RH (<35% or>75%), ±1.8°F/1°C
  • Beeper sounds and bright LED flashes when humidity level exceeds 65%RH
  • Facial icons indicate comfort zone (between 40 to 60%RH) and uncomfortable zone (too dry < 40%RH or too humid > 60%RH) - see icon chart on the right
  • Stores and recalls Max/Min readings
  • Desktop stand can be removed for wall mount use
  • Dimensions: 3.9x3.9x0.9" (98x98x23mm); with stand 3.9x4.3x 2" (98x109x55mm); Weight: 3.1oz (87g)
  • Complete with stand and 2 AAA batteries


  • Commercial, retail and residential sites prone to mold
  • Laboratories, R&D, server rooms, clean rooms and bio-pharmaceutical manufacturing
  • Museums and storage and document archive facilities
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.)

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