TWO IN ONE: This mini digital hygrometer thermometer features a built-in probe, combining an electronic thermometer and hygrometer to measure temperature and humidity for indoor use. WIDE TESTING RANGE: Measures temperature from -58°F to 158°F and humidity from 10% to 99%RH. HIGH PRECISION DISPLAY: Temperature measurement accuracy is ±2°F; humidity measurement accuracy is ±5%RH. EASY TO INSTALL: Designed with an embedded opening size of 1.81 x 1.06 inches. If the size does not fit, the unit can be secured with double-sided tape. WIDELY USED: Ideal for use in greenhouses, gardens, guitar cases, incubators, brooders, offices, cellars, refrigerators, closets, and other locations requiring temperature and humidity monitoring. Color: Black Material: ABS Size: Approximately 48 x 28.5 x 15.6mm Package Contents: 6 x Digital Thermometers Note: Light reflection and differences in display screens may cause slight variations between the color of the item in the photo and the actual product. Measurement allows for an error of ±1-3cm.