Description Indoor and outdoor thermometer: This 4-inch diameter outdoor thermometer provides reliable temperature and hygrometer readings (humidity measurement) for your outdoor space. Robust outdoor construction, sturdy metal with a real glass lens and a satin nickel finish. This wall-mounted thermometer implements a green concept: battery-free, energy-saving and environmentally friendly. Easy to read: The decorative outdoor thermometer easily keeps track of the temperature from a distance with bold black dial graphics. Celsius and Fahrenheit: This simultaneous digital Celsius and Fahrenheit temperature display for the garden. This 4-inch analog metal thermostat for the patio is a great way to add classic style and reliable temperature readings to your outdoor space. Real glass lens: This indoor thermometer has a real glass lens and is accurate between 0 and 100% / -15 and 50°C to suit all climates. Automatic calibration: This precision coil thermometer ensures accurate readings. The thermometer calibrates automatically; simply place it in a fixed location. After 2 hours, the pointer will automatically correspond to the local temperature.