1. Multi-function display, large display panel with dual-scale weather change logo 2. Readings Comparison: The contrast pin on the lens is used to compare readings to see if atmospheric pressure rises or falls over a certain period of time. 3. Wide Applicability: Generally applicable to ships, factories, laboratories, families. 4. Easy to Install : and easy to install, suitable for hanging or placed on a . 5. The product is used to measure the temperature, humidity, atmospheric pressure and other parameters in the environment. It accurately predicts weather changes according to the changes of ambient temperature, humidity and atmospheric pressure. It is a full-featured household weather forecast meter. Mechanical thermometer hygrometer Barometer, no battery required Usage:Outdoor Display Type:Digital :Temperature Controller Style:Wall Hanging Name: Barometer,Moisture meter, Thermometer Measuring range: 720-800hPa,-30Celsius-50Celsius,0-100% Resolution: 1C, 2% RH, 1hPa Thickness: about 33mm/1.3inch Embedding diameter:56mm/2.20inch Embedding height: 20mm/0.79inch colour:Golden Material:Aluminum alloy + plastic size:Diameter 72mm Package Contents: 1 x Barometer 1 x Thermometer 1 x Hygrometer Only the above package content, other products are not included. Note: Light 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.