The instrument used for measuring relative humidity is called

The instrument used for measuring relative humidity is called a hygrometer. A hygrometer is a device that measures the amount of moisture or water vapor in the air. It is an important instrument used in meteorology to help understand and predict weather patterns. The two common types of hygrometers are the mechanical and electronic hygrometers. The mechanical hygrometer uses a human hair or a piece of organic material that changes length in response to humidity changes. The electronic hygrometer, on the other hand, uses sensors to measure humidity levels and displays the readings on a screen.