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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.
To see the full specifications for this product, please see our product manual found under the PDF Manual for H21-USB
Dimensions: 22.2 cm (8.75”)
Weight: 5.3 g (0.19 oz)