The Extech Precision Psychrometer RH390 has a high 2% RH accuracy, a fast response time, less than 30 seconds, and a dual backlit display.
The RH390 can simultaneously display humidity and temperature, humidity and dew point, or humidity and wet bulb measurements.
- Offers a dual backlit display
- Made with a slim design complete with rubberized sides for better grip and for one hand use
- Includes Data Hold and Min/Max functions
- Auto-powers off with disable feature
- Alerts user with low battery indicator
- Has a simultaneous display of humidity/temperature, humidity/dew point or humidity/wet bulb
|Humidity||0 to 100%RH|
|Internal Temperature||-4 to 199°F (-20 to 100°C)|
|Basic Accuracy||±2%RH, ±1.8°F/1°C|
|Max Resolution||0.1%RH, 0.1°F/°C|
|Dewpoint||-22 to 199°F (-30 to 100°C)|
|Wet Bulb||32 to 176 °F (0 to 80°C)|
|Dimensions||7.8" H x 1.7" W x 1.3" D|
|Weight||7 oz (200g)|
The Extech RH390 Precision Psychrometer is available with standard factory calibration or with NIST Calibration Certification (adds 5 days to product lead time). NIST certification offers a traceable certificate that satisfies ISO & other regulatory requirements for product accuracy traceability to nationally recognized reference standards.
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Please see our warranty page for more information regarding the warranty on this item.
- Return windows close 30 days after you receive your item.
- You are responsible for obtaining a Return Merchandise Authorization, the cost of shipping, and potential restocking fees, if the item has been opened.
- To start a return, or to view the full returns policy, click here.