4 inches 4 stks/set thermometer hygrometer barometer watches clock copper shell zirkonium marine for weather station 83xa

characteristics: 1. precision temperature sensing turbine; precision wet turbine; precision gearing structure barometer movement; 1 second precision clock movement; metal points. 2. comparison: the contrast pin on the lens has been used to see similar readings when atmospheric pressure rises or falls over a certain period. three. wide applicability: generally applicable to ships, factories, laboratories, families. four. easy to install is lightweight and easy to install, suitable for mountin