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How it works:using your phone and a Spotting scope or rifle scope- look at the mirage through your optic, back focus-hold your phone at the angle the mirage is laying down - push the button that corresponds wit the tightens of the waves you see and it calculates wind speed, take that wind speed and plug it in what ever ballistic system you are using and your done,works the same way for rain angle based on normal rain mass you can shoot in, when using rain button

External Ballistics Pro