HYGROMETER AND PSYCHROMETER
The whirling hygrometer is made out of two thermometers mounted on a frame which rotates around a handle, so it can be whirled in the air by hand.
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This hand held whirling hygrometer is used for obtaining wet and dry bulb temperatures.
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Bacharach type sling Psychrometer for indicating percent relative humidity on the basis of the wet bulb-dry bulb thermometer principle. The plastic case of the instrument is equipped with conversion scale for calculating the percent relative humidity.