Note!!! The first time you use the thermometer you need to let the thermometer adapt to the environment for 10-20 minutes, so that the thermometer automatically calibrate the ambient temperature and humidity, the temperature will have about 1 error, humidity will have about 5% error!If you receive a product that does not work, please "contact the seller" and we will refund you or send a replacement product. We stand behind our products! [Mini and Accurate]The mini digital thermometer and hygrometer allow you to easily understand the surrounding environment temperature and humidity, and the attached expression function can help you take better care of your baby. [Easy to use] With magnet - can be attached to refrigerators and magnetic objects, with professional double-sided tape - can be pasted anywhere (please clean the pasted position before pasting) [Measurement range] Temperature measurement range: -10~60, temperature measurement accuracy: 1. Humidity measurement range: 10%-90%, humidity error: 3%. Measurement conditions are refreshed every 10 seconds. [Temperature and Humidity Monitoring] Helps you to measure indoor humidity and temperature, help adjust humidifier, dehumidifier settings and humidifier equipment, can prevent colds, dry skin, asthma, mold and other adverse symptoms, help the family's living conditions and healthy.