Extech Instruments Extech RH390 Precision Dual Display Hygro Thermometer Psychrometer

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Dual... Display Hygro-Thermometer Psychrometer

Precision meter measures relative humidity from 0 to 100 percent with an accuracy of 2 percent RH and Temperature from -22 to 199 degrees F (-30 to 100 degrees C) with an accuracy of 1.8 degrees F/1 degrees C. Capacitance RH sensor provides a response time of less than 30 seconds.

Additional Features

The dual backlit display of Temperature and Humidity can be switched to show Humidity and Dew Point (-22 to 199 degrees F/-30 to 100 degrees C), or Humidity and Wet bulb (32 to 176 degrees F/0 to 80 degrees C). Slim design with rubberized sides provides improved grip. Other features include data hold, Min/Max record, Auto Power Off and low battery indicator

What's in the Box

Comes with carrying case, 9-volt battery, and user manual.


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RH490 Precision Hygro-Thermometer Psychrometer

Specifically designed for HVAC and water damage restoration contractors, this meter measures Temperature (-22 to 199 degrees F/-30 to 100 degrees C), Humidity (0 to 100 percent RH), Dew Point (-22 to 199 degrees F/-30 to 100 degrees C), Wet Bulb (32 to 176 degrees F/0 to 80 degrees C), and Mixing Ratio in GPP (grains per pound/grains per kilogram) 0 to 1120 GPP/0 to 160g/kg. Less than 30 second RH response time with 2 percent RH accuracy. Additional features: dual backlit LCD display, Data Hold, Min/Max, and a slim design with rubberized sides for better grip.

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