Features: 4-in-1 Multifunction Hygrometer: it not only can measure temperature & humidity, but also measure wet bulb, and dew point temperature. Wide Range of Measurement: -20~60 celsius (-4~140 Fahrenheit ) of temperature and wet bulb temperature, 0~99.9percent RH of humidity, -50~60 celsius (-58~140 Fahrenheit ) of dew point. More Features of Thermo-hygrometer: data hold function, can hold the reading; MAX/MIN function, it will show the highest/lowest reading on the display; manual / auto power OFF optional; low battery indication. Handheld LCD Screen Meter: this wind speed gauge equipped a LCD screen with backlight, can reading better and clearer both under sun or in dark. Compact and lightweight, you can keep it in pocket. Wide Applications: it is widely used in industry, agriculture, meteorology, medical, daily life, building engineer, in wine cellar, machine room and data storeroom. Specifications: Material: ABS Ambient Temperature Range: -20~60 celsius (-4~140 Fahrenheit ) Ambient Humidity Range: 0~99.9percent RH Wet Bulb Temperature Range: -20~60 celsius (-4~140 Fahrenheit ) Dew Point Range: -50~60 celsius (-58~140 Fahrenheit ) Auto Power-off: 30 minutes Power Supply: 3 * 1.5V AAA battery (NOT included) Item Size: 143 * 58 * 26mm / 5.63 * 2.28 * 1.02in Item Weight: 114g / 4.04oz Package Weight: 185g / 6.55oz Package Size: 18.3 * 9 * 5.5cm / 7.20 * 3.54 * 2.17in Package List: 1 * Meter 1 * Pouch 1 * Manual (English)