The anemometer is useful for determining wind speed. It is made of corrosion resistant materials for prolonged outdoor use. One cup is red to facilitate the determination of the number of rotations. It is simple enough for students to understand and use, while accurate enough to be used by professional meteorologists in weather forecasting. The unit consists of a pole with rotating suction cups. These cups are mounted on horizontal arms that extend from the axis of rotation. When using it, make sure that each cup is pointed in the same direction with its face perpendicular to the floor.