"With some of the new herbicide technology labeled for use this year, growers need to be paying more attention than ever to the wind in order to reduce drift. I would urge everyone that plans to apply auxin herbicides to invest in a wind meter. There are a wide range that wind meters that go for $25-$600. The one pictured below goes for $74 on Amazon."
https://peedeeagnews.wordpress.com/2017/04/28/good-spray-day-or-bad-spray-day/

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Pee Dee Crop Producer Reports
Pee Dee Crop Producer Reports