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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 before an observation. When the bulbs are
suitably ventilated, they indicate the thermodynamic wet- and
dry-bulb temperatures of the atmosphere. One variety is the
Assman psychrometer (a special form of aspiration psychrometer
for which the ventilation is provided by a suction fan).

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[Summary provided by the National Snow and Ice Data Center]