Red Liquid Mason Hygrometer Provides Fast, Accurate Humidity Readings without Mercury
Red Liquid Mason Hygrometer uses a safe, easy-to-read red liquid instead of mercury. One thermometer bulb is kept constantly wet by a siphon reservoir while the other provides a dry temperature reading. Humidity is obtained by comparing the two readings on the included humidity chart. Dual temperature scales of 10°–120°F and –10° to 50°C. Red Liquid Mason Hygrometer measures 12"H x 3"W x 1–1/2"D.