Sunday, March 11, 2012

Red Liquid Masons Hygrometer

Red Liquid
Red Liquid Masons Hygrometer
by Sper Scientific

Buy new: $16.50

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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 two readings on the enclosed chart. The red liquid masons hygrometer uses a safe and easy to read red liquid in place of the usual mercury. Dual scales of -10/50�C and 10/120�F.

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