Wind speed is self-powered by roof-top or mast-head rotating cups, and is shown on two scales for accuracy: 0-40 and 0-120 knots (2-S unit only). Maximum gusts are registered even if you're not there to watch the action. LEDs to indicate direction are powered by either 110-volt or 12-volt DC. Comes complete with cables, sensors, mounting hard-ware, and AC adapter.
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