Battenfeld Cross Wind™ Professional Wind Meter661120125006 The Caldwell CrossWind Professional Wind Meter was designed to be the best wind meter on the market for ballistic application. Knowing wind speed gives the shooter the ability to more accurately judge shot placement in varying wind conditions. The 90 rotating anemometer head allows you to measure exactly how much Crosswind will be applied on the side of your bullet without ever having to move the wind meter or do angle calculations. Both