Features:Versatile design: Use calibrated sensing modules to reduce deviations and improve accuracy, with temperature units selection for fast switching.Widely applicable to temperature and humidity measurement of room, subway, library, commercial center, communication centers and other equipment.Portable and convenient handheld size: The meter is small and portable, and the white backlight LCD display can be used in dark environments.High-precision design: Humidity and temperature are designed with high-precision humidity and temperature sensors for high accuracy, fast response and stable readings.More functions: Data hold, MAX/MIN, enable/disable auto power off, over range indication, low battery indication.Specification:HumidityMeasuring Range: 0~100%RHRangeAccuarcyResolution45~75%RH3.0 %RH0.1Other4.5 %RHTemperatureRangeAccuarcyResolution-20~701.00.1-4~1581.8Dew Point Temp.-20~701.50.1-4~158 2.7Accuracy is bades on environment condition of 25, 40%-100%RHWet Bulb Temp.-20~701.50.1-4~158 2.7Data Update0.5sAuto Power Off15minOperqating Environment-20~60/-4~140, 10%RH~90%RHStorage Environment-20~60/-4~140, 10%RH~75%RHPower Supply3 x 1.5V AAA batteries (NOT included)Battery Life>50 hoursDimensions168x55.6x30.8mm / 6.6x2.2x1.2inWeight139g (approx.)Package List:1 * Temperature Humidity Meter1 * User Manual