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Hygrometer
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=== Metal-paper coil type === The metal-paper coil hygrometer is very useful for giving a dial indication of humidity changes. It appears most often in inexpensive devices, and its accuracy is limited, with variations of 10% or more. In these devices, water vapor is absorbed by a salt-impregnated paper strip attached to a metal coil, causing the coil to change shape. These changes (analogous to those in a [[Bimetallic strip|bimetallic thermometer]]) cause an indication on a dial. There is usually a metal needle on the front of the gauge that points to a scale.
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