Happyaer Hygrometer 4 Inches 4 PCS/set Thermometer
Happyaer Hygrometer 4 Inches 4 PCS/set Thermometer Hygrometer Barometer Watches Clock Copper for Shell Marine fo 1.Precision temperature sensing hairspring; Precision wet hairspring; Precision gear transmission structure barometer movement; 1 second precision clock movement; Metal 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 for time. 3.Wide Applicability: Generally applicable to ships, factories, laboratories, families. 4.Easy to Install is lightweight and easy to install, suitable for hanging or placed on a surface. Material: brass for shell, plastic bottom for shell, acrylic plastic lens...