Auto Calibration: This weather thermometer comes with a thermometer coil to ensure accurate readings. It adopts built-in automatic detection device to realize real-time detection with automatic calibration Traditional dial design: The thermometer adopts the original pointer and dial design, which is different from digital thermometers, making you different from others Measurement range: This hygrometer thermometer can accurately measure temperature and humidity, ranging from -20 to 100 / -30 to 50. Humidity range is 10%-100% Rh Portable: The thermometer is 5.8cm in diameter, so you can easily take the hygrometer anywhere for almost any measurement scenario Wide application: the weather thermometer hygrometer can be used indoors and outdoors, such as walls, tables, refrigerators, doors, freezers, greenhouses, terrariums, cars, baby rooms, etc.