Precision Hygro-Thermometer RH490 by Extech

Highest 2% RH accuracy with Grains Per Pound (GPP) Display Less then 30 seconds of RH response time Water vapor in GPP Dual backlit display Simultaneous display of: Humidity/Temperature Humidity/Dew Point Humidity/Wet Bulb Slim design with rubberized side grips Data Hold and Min/Max functions