An instrument that uses the difference in readings between two thermometers, one having a wet bulb and the other having a dry bulb, to measure the moisture content or relative humidity of air.

• 干湿表，湿度计一种测量空气中含水量或相对湿度的仪器，通过两支温度计（一支为湿管另一支为干管）的读数差得出结果