Compact and Versatile: With a diameter of 1.8 inches and a thickness of 0.55 inches, this hygrometer is perfect for diverse settings such as homes, offices, cars, and cellars. It can be easily mounted on walls or integrated into containers like tanks, barrels, and glass jars, enhancing its utility and accessibility. Enhanced Functionality: Featuring improved vent design for optimal airflow and an upgraded power switch for enhanced durability and convenience. This design ensures more accurate and reliable measurements, making it an essential tool for maintaining ideal environmental conditions. Precision Monitoring: Equipped with new sensors, this device offers a humidity range of 20%RH to 99%RH with an accuracy of 5%RH, and a temperature range of 14 to 140 with an accuracy of 1.8. Its high precision makes it suitable for sensitive environments like greenhouses, labs, and reptile enclosures. Rapid Response and Temperature Conversion: Updates measurement results every ten seconds, allowing for timely adjustments. Easily switch between Fahrenheit and Celsius to suit your preferences, ensuring you have the necessary information in the format you are most comfortable with. Complete Package: Powered by one LR44 battery, each pack includes three hygrometers with batteries installed, three extra LR44 batteries, and six pieces of double-sided tape for easy installation. This set provides all you need to start monitoring your environment immediately. Colour:White Material:Plastic Package Contents: 3 * -hygrometers 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 +/- 1-3cm.