Automatic calibration: The outdoor thermometer does not need batteries, has a built-in temperature and humidity sensor, and automatically calibrates within 3 hours, and the pointer will automatically match the local temperature Adaptable: Wall thermometer temperature range from -40 to 60°C, -40 to 140°F, both Celsius and Fahrenheit, humidity range from 0 to 100% RH, suitable for all weathers and climates Easy to Read and Use: The bold black font in the large numbers on the 10" outdoor thermometer makes temperature and humidity readings easier, even from far away Wide Application: The large thermometer is the perfect addition to any occasion, the holes in the back allow you to easily hang it in greenhouses, warehouses, bedrooms, offices, warehouses, laboratories, balconies, gardens, patios, anywhere you want Note: If your outside thermometer is not accurate, you can put it in the refrigerator for two hours and let it calibrate automatically, or manually calibrate through the small hole on the back of the thermometer The indoor and outdoor thermometer is used to measure the temperature and relative humidity of the environment, so that you can understand the temperature and humidity of the environment in a timely manner so that you can take appropriate measures to adapt or change your environmental temperature and humidity to ensure your living environment Comfortable and dry, the exquisite appearance of the large digital wall -mounted thermometer is any terrace, the ideal decoration of the room or garden