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 TESTING RANGE: Temperature measuring range: -58°F to 158°F; humidity measuring range: 10%–99% RH. HIGH PRECISION DISPLAY: Temperature measurement accuracy: ±2°F; humidity measurement accuracy: ±5% RH. EASY TO INSTALL: Designed for wall or surface mounting; embedded opening size: 1.81 x 1.06 inches. If the opening size is not suitable, it can be fixed with double-sided tape. WIDELY USED: Suitable for greenhouse, garden, guitar case, incubators, brooders, office, cellar, refrigerator, closet, and other indoor environments requiring temperature and humidity monitoring. Color: Black Material: ABS Size: Approximately 48 x 28.5 x 15.6 mm Package Contents: 6 x Digital Thermometers Note: Light reflection and display differences may cause slight color variation between the image and the actual product. Measurement tolerance: ±1–3 cm.