Applicable for home, office, car, schools, hotels, laboratories, kindergartens, aquaculture, instrument workshop, libraries, schools, factories and places equipped with condition, etc. This portable hygrometer thermometer Measures Indoor humidity and temperature in time, help to adjust the humidifier, dehumidifier settings and humidistats, great for monitoring familys living conditions and health by preventing colds, dry skin, asthma, mold. Fast response that measures every 10 seconds with 24 sensitive VENTS to provide updated and accurate readings, wide measuring range that measures temperature from 00 to 500, measures humidity from 10% to 99%. (Please allow for a certain amount of error) Temperature range is Celsius only on this model, and black front panel with a clear LCD display, easy to read even from a far distance. Measuring humidity accuracy: + 5% Humidity display resolution: 1%RH Measuring temperature range :0c to 50 Celsius Measurement temperature accuracy: + 1 Celsius Temperature display resolution: 01 Celsius Install panel hole size: D42mm Operating Voltage: 15V, one button cell size LR44 colour:Black Material:Plastic shell ABS size: 45*155mm Package Contents: 5*digital hygrometer 5*Button Battery