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The hygrometer is specifically designed to measure humidity, which is the amount of water vapor present in the air. This instrument provides valuable information about the moisture content of the atmosphere, which is essential for various applications, including meteorology, agriculture, and environmental studies.

There are different types of hygrometers, such as analog and digital models, but they all serve the primary purpose of indicating humidity levels. Understanding humidity is crucial as it affects weather patterns, plant growth, and human comfort.

While a psychrometer also measures humidity, it does so by using two thermometers—one dry and one wet—to calculate the relative humidity. This makes it more of an indirect method compared to a hygrometer, which can provide direct readings.

In contrast, a wind vane measures wind direction, and a thermometer measures temperature. Neither of these instruments provides any information about humidity levels. Hence, when specifically looking for the instrument designed for measuring humidity, the hygrometer is the clear choice.