Precision Hygro-Thermometer Highest 2% RH accuracy With Grains per Pound (GPP) and Grams per Kilogram (g/kg) measurement Features: • Less than 30 second RH response time • Water vapor in GPP (g/kg) • Dual backlit display • Simultaneous display of: Humidity or GPP (g/kg) plus Temperature Humidity or GPP (g/kg) plus Dew Point Humidity or GPP (g/kg) plus Wet Bulb • Slim design with rubberized sides for better grip and for one hand operation • Data Hold and Min/Max functions • Auto power off with disable and low battery indicator • Complete with carrying case and 9V battery Specifically designed for HVAC and water damage restoration contractors Specifications Humidity Temperature (Internal) Basic Accuracy Max. Resolution Dewpoint Wet Bulb Absolute Humidity Dimensions Weight 0 to 100%RH -22 to 199°F (-30 to 100°C) ±2%RH, ±1.8°F/1°C 0.1%RH, 0.1°F/°C -22 to 199°F (-30 to 100°C) 32 to 176 °F (0 to 80°C) 0 to 1120GPP (0 to 160g/kg) 7.8x1.7x1.3" (200x45x33mm) 7oz (200g) Ordering Information: RH490 ..............Precision Hygro-Thermometer RH490-NIST ....RH490 w/ Certificate of Calibration Traceable to NIST. www.extech.com Specifications subject to change without notice. 2/22/12 - R1 Copyright © 2008-2011 Extech Instruments Corporation. All rights reserved including the right of reproduction in whole or in part in any form.