Which of the following instrument can be used to measure relative humidity?

The instrument that can be used to measure relative humidity is a hygrometer. Relative humidity refers to the amount of moisture or water vapor in the air compared to the maximum amount the air can hold at a given temperature. A hygrometer measures the amount of moisture in the air and gives a reading of the relative humidity. There are different types of hygrometers, such as mechanical, electronic, and psychrometric hygrometers. Some of these instruments work by measuring the change in electrical resistance or capacitance caused by moisture, while others use a wet and dry bulb thermometer to measure the difference in temperature between a dry and wet surface. An anemometer measures wind speed, a wind gauge measures wind direction, a barometer measures atmospheric pressure, and a thermometer measures temperature. While these instruments may be useful in predicting or indicating changes in relative humidity, they do not directly measure it.