The Thermometer Hygrometer can display three types of temperatures around the sensor's air via several convenient procedures: The ambient temperature, the dew-point temperature and the wet bulb temperature.Features: Data Hold Display Back Light MAX/MIN Data Logging up to 99 groups Low battery indication Wide Applications: Used in living and office area, machine room, data storeroom, traffic environment, timely knowing the temperature and humidity, playing an important role in building a healthy life. Used to check the plants’ living condition when planting flowers and trees. Used to keep track of bad moister on sound equipment which can harm electronics. Used to check the performance of heating and air conditioning equipment accurately by building engineer. Used to keep a cautious track of the humidity in wine cellar. Specification: Temperature range: -20~70°C(-4~158°F) Temperature accuracy: ±1°C, ±1%°C between 5~50°C(41~122°F) Humidity range: 0~100%RH Humidity accuracy: ±4%RH(25°C(77°F)/10~90%RH), Full range accuracy is ±5%RH Dew point & wet-bulb range:-20~50°C Dew point & wet-bulb: ±2°C, ±2%°C(5~50°C(41~122°F)/10~90%RH) Maximum response time: 30s Set comprise with: 1 x Humidity & Temperature Meter 1 x English User Manual 3 x AAA Battery Standard Factory Packaging