Usage Tips:Recommended uses for product landing pages Colorful Black 2-Pack Age Range (Description) Adults and Children Number of units 2 Battery quantity 2 LR44 requires batteries. Response time 10 seconds Lower limit of nominal temperature 50 degrees Celsius Show less About this item Measuring range: Temperature range: -50 to 70C; Temperature deviation: 2C. Humidity range: 10%~99% RH; Humidity deviation: 5% RH. Mini and simple design: Thanks to its mini body and square shape, the device can be placed discreetly anywhere. The simplest appearance and very practical function. The screen can be easily read without any operation. Widely Used: You can use it at home, office, car, school, hotel, laboratory, kindergarten, aquaculture, instrument workshop, library, factory, greenhouse, basement, garage, garden shed, filament box 3D printer and places equipped with air. for conditioning, etc. Indoor Humidity Monitoring: Helps you measure indoor humidity and temperature over time, helps adjust humidifier, dehumidifier settings, and Humidistat, ideal for monitoring home living conditions and preventing colds, dry skin, asthma and mold-related health issues. What you get: Digital hygrometer thermometer*2 . Each unit contains two AG13 button cell batteries. Please replace the battery when the screen goes dark.