Wind speed and wind direction sensor for Ecowitt WN67 or WS69 sensor array. Only suitable for the I shaped array with wind direction and speed mounted above each other.
Easily fitted by removing one large nut/bolt and then a smaller locking screw within the main arm. Bottom section them twists off to reveal two cables releasing the anemometer sensor array. Ensure the two cables are marked to reassemble as they are identical, see photo for original factory marking in black.