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Sper Scientific 736700 Accurate Sling Psychrometer - 5 ~ 50 Celsius. Obtain fast and accurate humidity readings anywhere by comparing the reading of the wet and dry bulb thermometers on the enclosed humidity chart Eliminates the hazard of splattering mercury by using a safe and easy to read red liquid. Obtain fast and accurate humidity readings Red Liquid 8-1/2 x 6 x 1"