Specifications: Made of a coil spring-type sensing elements, no battery is required. Sensitive to accurately measure the real-time temperature and relative humidity of your environment. Small size and easy to carry, you can also hang it on the wall. Analog display, convenient to read the data. Type: Analog Thermometer Hygrometer Material: Aluminum Alloy + Plastic Accuracy: 0.1 Temperature Meter Range: -30-50 Degree Celsius Humidity Meter Range: 0-100% RH Temperature Meter Accuracy: 2 Degree Celsius Humidity Meter Accuracy: 2% RH Temperature Measurement Error: +/- 2 Degree Celsius Humidity Measurement Error: +/- 5% (40% - 70%) (RH) Features: Analog Display, Round, Mini, Wall Hanging, Portable Size: Diameter: 58mm/2.28", Thickness: 13.5mm/0.53" (Approx.) Notes: Due to the light and screen setting difference, the color of item may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Package Includes: 1 x Analog Thermometer Hygrometer