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Red Liquid Masons Hygrometer. One thermometer bulb is kept constantly wet by a siphon reservoir while the other gives a dry temperature reading. Humidity is obtained by comparing the readings on the enclosed chart. Uses a safe and easy to read red liquid in place of the usual mercury. Dual Scale of -10/50°C & 10/120°F. Dim: 12" x 2-7/8" x 1-1/4". Wt: 3.8 oz.




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