If it ain’t broke, don’t fix it. A Sling Psychrometer is a simple device used to measure relative humidity in the atmosphere. It consists of a handle with two thermometers: A regular ...

PUPIL: We need to spin the sling psychrometer around. PUPIL: For how long? PUPIL: About thirty seconds. KAWSER: Humidity can be measured using an instrument called a sling psychrometer.

The air temperature and the relative humidity are measured with a combined sensor ... Calibration is carried out by comparative measurements using a hand-operated aspiration psychrometer.