Mengshen Digital Temperature and Humidity Meter - with Dew Point and Wet Bulb Temperature - Battery Included, M86 2 in 1 digital Humidity and Temperature Meter. Accurately measure any environments temperature, relative humidity (RH), dew point, wet bulb temperature, One-step switch between C and F, Device will power off automatically to save battery when not in use in several minutes, Adjustable LCD backlight for clearly showing data, Powered by 9V battery which is included. 1 x Digital Humidity and Temperature Meter 1 x 9V Battery 1 x use manual Humidity: 0 to 100% RH Temperature: -20C to 80 C (-4F to 176F) Dewpoint Temperature: -20C - 80C (-4F - 176F) Wet Bulb Temperature: 0C - 80C (32F - 176F) Humidity: 3% RH Temperature: 0.9F/0.5C (at 77F/25C) Resolution: 0.01%RH, 0.01F/0.01C