The technology has actually been around for a while Pengy. It’s put out by the Jackass manufacturing company (there’s a branch in NZ) and the model you require is the Gofor version
You affix the special wind direction tapes to the Gofor, and whoever is wearing it strides out and stands as close as possible to the target for the most accurate readings......
Obviously the Gofor needs to be (told to be) moved away a little from the target if a .50BMG is in use (it damages the tapes, requiring replacement), and particularly if magnum rounds are being shot at tin, the dancing around is an added entertainment bonus
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