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> Red liquid mason't hygrometer - sper scientific 736740
Red liquid mason't hygrometer - sper scientific 736740
Measure Humidity - Mason's Hygrometer - Red Liquid - 5 Year Warranty
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.
