noun
wet and dry-bulb thermometer; psychrometer
A meteorological instrument that uses paired wet-bulb and dry-bulb thermometers to measure humidity.
気象観測では、乾湿球湿度計を使って湿度を測ります。
In meteorological observation, humidity is measured using a wet and dry-bulb thermometer.
湿度計 is a general term for any hygrometer, while 乾湿球湿度計 specifically refers to the wet and dry-bulb type.
Compound of 乾湿球 (wet and dry bulb) and 湿度計 (hygrometer).