Compact and Versatile: With a diameter of 1.8 inches and a thickness of 0.55 inches, this hygrometer is suitable for various environments such as homes, offices, cars, and cellars. It can be easily mounted on walls or placed inside containers like tanks, barrels, and glass jars, enhancing its utility and accessibility. Enhanced Functionality: Features an improved vent design for optimal airflow and an upgraded power switch for increased durability and ease of use. This design supports more accurate and reliable readings, making it a practical tool for monitoring environmental conditions. Precision Monitoring: Equipped with updated sensors, this device measures humidity from 20%RH to 99%RH with an accuracy of ±5%RH, and temperature from 14°F to 140°F with an accuracy of ±1.8°F. Its high precision makes it ideal for use in sensitive areas such as greenhouses, laboratories, and reptile enclosures. Rapid Response and Temperature Conversion: Updates readings every ten seconds for timely monitoring. Easily switch between Fahrenheit and Celsius to view measurements in your preferred unit. Complete Package: Powered by one LR44 battery per unit. Each pack includes three hygrometers with batteries installed, three spare LR44 batteries, and six pieces of double-sided tape for convenient installation. Everything you need to start monitoring right away. Color: White Material: Plastic Package Contents: 3 x Hygrometers Note: Light reflection and differences in display screens may cause slight variations between the color of the item in the image and the actual product. Measurement error is +/- 1-3cm.