Sper Scientific 736710 Sling Psychrometer - Measure Humidity

Sper Scientific Sling Psychrometer - Measure Humidity - 20 120 Fahrenheit,Eliminates the hazard of splattering mercury by using a safe and easy to read red liquid.,Obtain fast and accurate humidity readings,Red Liquid, x 6 x 1"You may also like Western Enterprises 312-CK-31 0.25 in. NPT Pipe Thread Fittings.