Precision Hygro-Thermometer with Direct Display of Grains Per Pound (GPP)


Extech Instruments, a major supplier of test and measurement equipment for the industrial marketplace, announces its new Precision Hygro-Thermometer with Direct Digital Display of Grains per Pound (GPP), Model RH490. Ideal for structural drying and water damage restoration, HVAC/R installation and repair, mold inspection and remediation, and plant maintenance, Extech’s RH490 features 2% RH accuracy and a RH response time of less than 30 seconds to help tackle the most challenging humidity and moisture problems.

The dual backlit display of the RH490 enables the simultaneous viewing of Humidity or Grains per Pound, along with Air Temperature, Dew Point or Wet Bulb. It incorporates a slim design with rubberized sides for better grip and one-hand operation.

The RH490 features a data hold and auto power off with disable and low battery indicator, and comes complete with carrying case and 9V battery.


• Humidity0 to 100%RH • Temperature (Internal)-30 to 100°C (-22 to 199°F) • Basic Accuracy±2%RH, 1°C/±1.8°F • Max. Resolution0.1%RH, 0.1°C/°CF • Dewpoint-30 to 100°C (-22 to 199°F) • Wet Bulb0 to 80°C (32 to 176°F) • Absolute Humidity0 to 160g/kg (0 to 1120GPP) • Dimensions200x45x33mm (7.8x1.7x1.3") • Weight200g (7oz)
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