The familiar cup-anemometer, is the best-known and most generally used wind speed indicator. Designed to easily fit 3/4″ posts, the 3 rotating 3″ dia. copper windcups mounted on a solid bearing system will indicate the speed of the wind with just a glance and is a great way to increase the function and fun of a weathervane. No steel parts!!!
(The post, balls, and directionals are not included)