Humidity Measurement
Hygrometers are devices to measure amount of water vapor present in the air or humidity. Two primary measurements of humidity are widely employed: Absolute humidity with g/m³ unit and Relative humidity with %RH unit.
There are various devices used to measure humidity, such as in the pass will use psychrometer that is suitable for greenhouse or anywhere. Now, hygrometers with digital or analog types are widely used. Easy to use and large display screen, many selection of types and functions.