A vane anemometer is a device used to measure wind speed. It consists of a set of blades or vanes that rotate when wind blows. The speed of rotation is directly related to the wind speed, allowing for accurate measurements. These instruments are commonly used in meteorology, aviation, and environmental studies. By providing real-time data on wind conditions, vane anemometers help in weather forecasting and assessing air quality. They are often portable and can be used in various outdoor settings.