①. TWO IN ONE: The mini digital hygrometer thermometer with built-in probe, electronic thermometer and hygrometer for measuring temperature and humidity for indoor use. ②. WIDE TESTING RANGE: Humidity meters measuring range: -58-158 , humidity measuring range: 10%-99%RH. ③. HIGH PRECISION DISPLAY: Humidity Meter measurement accuracy: 2, humidity measurement accuracy: 5%RH. ④. EASY TO INSTALL: Our humidity meters gauge can help you to know the current temperature and humidity, embedded opening size (1.81x1.06 inch). If the size is not suitable, it can be fixed with double-sided tape. ⑤. WIDELY USED: The indoor thermometer hygrometer widely use in greenhouse, garden, guitar case, incubators, brooders, office, cellar, fridge, closet any other place that requires monitoring of temperature and humidity levels. ⑥. Colour: black ⑦. Material: ABS ⑧. Size: about 48 x 28.5 x 15.6mm ⑨. Package Contents: 6 x Digital Thermometers ⑩. Only the above package content, other products are not included. ⑪. 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 +/- 1-3cm.