Taylor 5525J1 Mason's Hygrometer, Wall Mount, 0 to 120 °F, 1% to 97% Humidity, ±2 °F Accuracy, Liquid-in-Glass

Hygrometer, Scale Type Liquid-in-Glass, 0 °F to 120 °F, Primary Scale Temperature, Dial Design Black and Red Markings with Red Liquid Fill on White Dial, Case Material Polystyrene, Graduations 2 °F, Humidity Range 1% to 97%, Wall, 10 in L x 4 in W.

Mason's hygrometers use a dry bulb thermometer and wet bulb thermometer to measure ambient temperature and humidity. A chart or table included with the hygrometer displays the difference between the two readings, allowing users to estimate the humidity without an electronic tool.