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Any instrument that measures the water vapor content of the atmosphere.
There are six basically different means of transduction used in measuring this
quantity and hence an equal number of types of hygrometers. These are 1) the
psychrometer, which utilizes the thermodynamic method; 2) the class of
instruments that depends upon a change of physical dimensions due to the
absorption of moisture (see hair hygrometer, torsion hygrometer,
goldbeater's-skin hygrometer); 3) those that depend upon condensation of
moisture (see dewpoint hygrometer, frost point hygrometer); 4) the class of
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