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