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Brannan Whirling Hygrometer
Whirling Hygrometers, also known as sling psychrometers, employ the “wet” and “dry” bulb principal to determine %RH.
These hygrometers are filled with a blue spirit filling and have a fixed handle designed to be rotated, by hand, to provide adequate and consistent ventilation of the bulbs.
It is supplied complete in a protective canvas carry case with calculator chart and instructions to determine %RH and two spare wicks.
