Wall-mounted hygrometer thermometer is suitable for both indoor & outdoor. Mercury free analog wall-mounted hygrometer and thermometer with large, easy-to-read temperature readings ranging from -20°C to 50°C (0°F to 120°F). It is used to measure the temperature and humidity in both indoor and outdoor. Wall mounted plastic case comes with built in hanger hole. Recommended to hang on wall at home, workshop, school, kitchen, warehouse, etc. Do not expose thermometer to heavy shock.