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You don’t need the kestrel for the Sig it has all the same stuff built in,
You use the included weather flow wind meter for wind, and the laser has a weather meter built in.
Why do you need a kestrel ?
I use a hand held wind meter and have a 10mph wind saved on the app, if you practice enough you can call wind pretty good. I have an I phone 6 and the included wind meter works on mine but I don’t use it