noun, plural: psychrometers
A simple form of hygrometer with two thermometer bulbs in which one is kept dry and the other is kept wet, and the two readings obtained are used to calculate for the relative humidity of the atmosphere
Psychrometers are used in determining the humidity of the atmosphere, and therefore can help predict the weather or precipitation events. Two major types of psychrometers include the sling psychrometer and the whirling psychrometer.
Word origin: Greek psychros (cold, frozen) + Greek metron (measure)