I use my ear. If i hear a brrrrrrrrrrrpppp it means someone has wind....
There is sound advice above about reading the wind from indicators between you and the target. I bought one. Played with it around the house and am yet to use it hunting. Have used it on the range the odd time to confirm estimation but bullet strike during practice tells you more about the accuracy of your estimation and gets you better tuned into subtleties and causes of variation
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