Sper Scientific Measure Humidity - Masons Hygrometer

Features Measure Humidity - Mason s Hygrometer - Red Liquid 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. - SKU: ZX99SPRCT067