Indoor and outdoor thermometer: This Dual use temp humidity gauge is designed with thermometer and hygrometer Diameter 13cm make it easy to read Ensures a comfortable environment for your family Especially when you or your child has allergies, sinuses,asthma or any breathing problems, this hygrometer will help you make sure the water in your home is good enough Energy saving: Precise hygrometer thermometer Adopt physical induction, thermal expansion and contraction principle, no battery requires, energy saving and environmental protection Unlike most other analog hygrometers on the market, its pointer are made of stainless steel, with glass cover and colored panels, high quality aluminum frame and plastic bracket, which makes it very stable and looks stylish, it's also a great indoor/outdoor wall decoration Temperature range: -30 ~ 50 C, measurement accuracy: 2 C Humidity range: 20~100%, measurement accuracy: 7% Compact & stand design: The analog hygrometer thermometer is suitable for standing on the desk steady with the foldable foot Or with the back hanging hole, you can hang it on the wall easily Scope of application: indoor and outdoor environments such as home, office, hotel, restaurant, school, conference room, factory, shopping mall, warehouse, waiting room, hospital, courtyard garden, greenhouse nursery, animal husbandry, etc