This grounding wire is required if using a wind speed or wind speed and direction sensor with the H21-USB or if the H21-USB will be placed in an exposed location on a tripod or tower.
This cable operates in an outdoor environment.
To see the full specifications for this product, please see our product manual found under the documentation tab if available
Dimensions: 22.2 cm (8.75”)
Weight: 5.3 g (0.19 oz)