1.【2 in 1 temperature and humidity】 - Indoor outdoor thermometer can be used indoors, such as wall, table, refrigerator, door, freezer, incubator, greenhouse, breeding box, car, baby room etc. or as a measuring tool to carry outside and use outdoors. Hygrometer is suitable for almost any measuring scene. 2.【Weight is easy to carry】- The thermometer is only 10cm in diameter and weigh is very light . The thermometer is the same size as the pocket watch, so you can easily take the hygrometer anywhere. 3.【Measuring range】- This hygrometer/thermometer accurately measures temperature and humidity simultaneously ranges between -20 and 120℉/-30 and 50℃ to accommodate all climates, both Celsius and Fahrenheit are available; humidity range from 10 to 100%RH. 4.【Auto calibration function】- This thermometer with a precision-made thermometer coil ensures accurate readings. This hygrometer uses a built-in automatic induction unit that enables real-time sensing, so you don't need to calibrate it. 5.【Unique dial design】 - The thermometer and hygrometer adopt the original needle and dial design, retro fashion, very suitable for people who like nostalgic decoration. The hanging loop on the back can be hung on the wall or placed on the table. This thermometer and hygrometer are different from digital thermometers, making you more special.