TWO IN ONE: The mini digital hygrometer thermometer with built-in probe, electronic thermometer and hygrometer for measuring temperature and humidity for indoor use. WIDE TEST RANGE: Humidity meters measure range: -50-70 ℃, humidity measurement range: 10%-99%RH. HIGH PRECISION DISPLAY: Humidity meter measurement accuracy: 2 ℃, humidity measurement accuracy: 5%RH. EASY TO INSTALL: Our humidity meters can help you know the current temperature and humidity, built-in opening size (46x27 mm). If the size does not fit, it can be fixed with double-sided tape. WIDELY USED: The indoor thermometer hygrometer is widely used in greenhouses, gardens, guitar cases, incubators, brooders, offices, basements, refrigerators, cabinets and other places that require monitoring of temperature and humidity levels. Color: black Material: ABS Size: approx 48 x 28.5 x 15.6 mm Package contents: 6 x Digital thermometers Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3 cm.