Key facts
- Brand
- EXTECH
- Model
- RH390
- Industry
- Industrial
- Documents
- 3
- Languages
- EN
- Last added
- 2022-09-29
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Extech RH390 Digital Psychrometer User's Guide
The Extech RH390 Digital Psychrometer is a device designed to measure humidity, air temperature, dew point temperature, and wet bulb temperature. It features advanced capabilities such as data hold, auto power off, and maximum/minimum reading functions to ensure reliable service.
Read onlineEXTECH RH390 specifications
| Wet Bulb Range | 0 to 80°C |
|---|---|
| Dew Point Range | -30 to 100°C |
| Response Time | <30 seconds |
| Operating Conditions | 32 to 122°F (0 to 50°C) |
| Power Supply | 9 Volt battery |
| Battery Life | Approx. 24 hours |
| Dimensions | 7.8 x 1.7 x 1.3 inches |
All EXTECH RH390 documents by type
Day-to-day operation, settings and troubleshooting. Start here if the product is already set up.
Questions answered in these manuals
How do I disable the automatic power off function?
Press and hold the Hold button while powering on the meter.
How do I view the maximum and minimum readings?
Press the MAX/MIN button to toggle between MAX and MIN modes.
How do I turn the meter on or off?
Press the power button to turn power on or off.
How do I replace the battery?
Remove the Philips head screw holding the rear battery compartment cover to access the battery compartment.
What is the RH390 and what does it measure?
The RH390 is a precision psychrometer that simultaneously displays humidity, temperature, dew point, or wet bulb readings.
What are the stated dimensions and weight of the device?
The unit measures 7.8x1.7x1.3 inches (200x45x33mm) and weighs 7oz (200g).