Applicable , office, car, schools, hotels, laboratories, kindergartens, aquaculture, instrument workshop, libraries, schools, factories and equipped with air condition, etc. This portable hygrometer thermometer Measures Indoor humidity and temperature in time, help to adjust the humidifier, dehumidifier and humidistats, great for monitoring familys living conditions and health by preventing colds, dry skin, asthma, mold. Fast response that measures 10 seconds with 24 to updated and accurate readings, wide measuring range that measures temperature from 0.0 to 50.0, measures humidity from 10% to 99%. ( allow for a certain amount of error) Temperature range is Celsius only on this model, bright and black front panel with a clear LCD display, easy to read even from a 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: 0.1 Celsius Install panel hole size: D42mm Operating Voltage: 1.5V, one button cell size LR44 colour:Black Material:Plastic shell ABS size: 45*15.5mm Package Contents: 5*digital hygrometer 5*Button Battery