1. MEASURING RANGE: temperature range: -20 C to 70 C; Temperature deviation: 1 C. Humidity range: 20% ~ 90% RH; Humidity deviation: 5% RH. 2. MINI & SIMPLE DESIGN: Thanks to its mini housing and its round shape, the device can be placed inconspicuously anywhere. With the simplest appearance and very practical function. With the round digital humidity thermometer you can easily determine the ambient temperature and humidity. Small and light enough to save space and carry around. 3. WIDE USE: You can use it at home, in the office, in the car, at school, in the hotel, in the laboratory, in kindergarten, in aquaculture, in the instrument workshop, in the library, in the factory, in the greenhouse , in the basement, in the garage, in the garden house, in the box for 3D printer filaments and in places with air - conditioning etc. 4. Embedded Thermometer: Help measure indoor humidity and temperature in time, adjust the humidifier, dehumidifier settings and humidifier, and monitor family living conditions and health by colds, dry skin, asthma and Prevent mold. 5. WHAT YOU WILL GET: 2 * digital hygrometer thermometer, each device contained an AG13 / LR44 button battery. Please replace the battery when the display gets darker.