Extech RH490 [RH490-NIST] Hygro-Thermometer with Grains Per Pound Display with NIST Calibration

Highest 2% RH accuracy with Grains Per Pound (GPP) Display. The Extech RH490-NIST not only measures relative humidity in 30 seconds, the handheld instrument captures dew point, wet bulb, temperature and water vapor levels (Grams per Kilogram and Grains per Pound). This utility tool will store maximum and minimum readings until the memory is cleared and includes a data-hold button for rapidly fluctuating measurements. With NIST Calibration.