Proskit MT-4616 Temperature Meter Features :- Ideal for metallurgy, electronics, chemical contamination or other high temperature environment and more. Tests ambient temperature, relative humidity, wet Bulb, dew Point temperature Data memory up to 99 memories Unit °F/°C selection High Precision & Portable for measuring Extra functions: Max./Min. value、Low battery indication、Auto power off、Backlight、Date hold Temperature Range -20~60°C(- 4°F~140°F) Temperature Accuracy ±1°C(0~45°C), ±1.5°C(-20~0°C, 45~60°C) Humidity Range 0~100%RH Humidity Accuracy ±3%(20%~80%), ±4%(0~20%, 80%~100%) Wet Bulb Temperature Range -20~60°C(-4~140°F) Wet Bulb Temperature Accuracy ±1°C(0~45°C), ±1.5°C(-20~0°C, 45~60°C) Dew Point Range -50~60°C(-58~140°F) Dew Point Accuracy ±1°C(0~45°C), ±1.5°C(-50~0°C, 45~60°C) Resolution 0.1C/F ; 0.1% Data Memory Max. 99 of data Unit selection °C / °F Auto power off After 30mins, on/off selection Power source AAA 1.5V x 4 (not included) Weight 114g(not including battery) Dimension 184 x 60 x 29mm Accessories Storage Bag、Instruction Manual