Temperature measurement range is 30 50°C / 20 100°F, Humidity range: 20~99% RH The special and beautiful design allows it to be applied as an ornament as well Back hooks make the thermometer suitable to install on wall or just put on your desktop No battery needed: never bother to use batteries; Our thermometer works well without battery because of its mechanical power You can apply it in houses, offices, workshops, schools, markets, warehouses, kitchen and more, Manufacturer: THOANBY