Here's why:

* Wind Vane: A wind vane is a simple device that spins freely to align itself with the direction of the wind. It's often shaped like an arrow with a tail that points into the wind.

* Anemometer: The instrument used to measure wind speed is called an anemometer. There are different types, but they all measure how fast the wind is moving.

Let me know if you'd like to learn more about anemometers!