I recommend you buy the larger anemometer units if accuracy is important. We had 4 anemometers side by side one day on the runway and this one was reading lower than the rest. I like the size, recessed buttons and design of this smaller unit. When I put this unit and a larger unit on a heat vent they read about the same but in the real world of wind readings side by side it is reading low by as much as 5mph in 15mph wind. Make sure you hold it away from your body so there is a clean airstream.
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