Analog Hygrometer Humidity Gauge in 3.5 inch Solid Oak Woodring. Spiral hygrometers are the most commonly used hygrometers. The measuring element consists of a spiral shaped metal strip that reacts to changes in the humidity.

• Easy To Read Hygrometer
• Maintains An Accurate Measure Of Humidity
• Metal Bezel and Calibration Screw
• Solid Oak Woodring
• Diameter : 3.5 in. (8.8 cm)
• Made in Germany