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 HygrometerMaterial: Aluminum Alloy + PlasticAccuracy: 0.1Temperature Meter Range: -30-50 Degree CelsiusHumidity Meter Range: 0-100% RHTemperature Meter Accuracy: 2 Degree CelsiusHumidity Meter Accuracy: 2% RHTemperature Measurement Error: +/- 2 Degree CelsiusHumidity Measurement Error: +/- 5% (40% - 70%) (RH)Features: Analog Display, Round, Mini, Wall Hanging, PortableSize: 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