A psychrometer is an instrument used for measuring the water vapor content of the atmosphere;
a type of hygrometer. It consists of two thermometers, one of which (the
dry bulb) is an ordinary glass thermometer, while the other (wet bulb) has
its bulb covered with a jacket of clean muslin which is saturated with distilled
water prior to an observation. When the bulbs are suitably ventilated, they
indicate the thermodynamic wet- and dry-bulb temperatures of the atmosphere.
AND MOISTURE CONTROL