Features: 4-in-1 Multifunction Hygrometer: it not only can measure temperature and 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 or MIN function, it will show the highest or lowest reading on the display manual or 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 x 1.5V AAA battery (NOT included) Item Size: 143 x 58 x 26mm or 5.63 x 2.28 x 1.02in Item Weight: 114g or 4.04oz Package Weight: 185g or 6.55oz Package Size: 18.3 x 9 x 5.5cm or 7.20 x 3.54 x 2.17in Package List: 1 x Meter 1 x Pouch 1 x Manual (English)