This is a full-size three cup anemometer. Weight adjustment on each arm for perfect balance.
Output is a magnetic switch closure.
PVC parts are precision drilled and tapped. With CNC machined aluminum spacer, stainless steel hardware and ball bearing, custom molded lead counterweight, and rugged heavy gauge PVC body, this instrument is built to withstand the elements. All components come precision drilled. A capacitive element changes in value in response to the relative humidity of the air. This capacitance is translated into a digital frequency by an integrated circuit timer.