  Measure humidity and temperature simultaneously with the Extech RH390 Precision Psychrometer.
A dual-illuminated readout can be alternated to display wet bulb and humidity, or dew point and humidity, or temperature and humidity.
This handheld device registers temperatures from -3 degrees to 100 degrees C and measures the full spectrum of relative humidity with ±2% accuracy between 20 and 90% RH.
Extech RH390 Features:
- Fast response time (<30 seconds)
- Dual backlit display
- Data Hold and Min/Max functions
- Simultaneous display of:
Humidity/Temperature
Humidity/Dew Point
Humidity/Wet Bulb - Slim design with rubberized sides for better grip and for one hand operation
- Auto power off with disable and low battery indicator
- Complete with carrying case and 9V battery
Automatic Power OFF
The RH390 has a default setting that automatically shuts the meter off after 10 minutes (indicated by a symbol on the display). This battery saving feature can be disabled by simply pressing and holding the “hold” button.
Extech RH390 Specification:
| Function | Range |
|---|---|
| Humidity | 0 to 100%RH |
| Temperature (Internal) | -30 to 100°C |
| Basic Accuracy | ±2%RH, ±1°C |
| Max. Resolution | 0.1%RH, 0.1°C |
| Dewpoint | -30 to 100°C |
| Wet Bulb | 0 to 80°C |
| Dimensions | 200 x 45 x 33mm) |
| Weight | 200g |
