Huh? Wind at the target matters... as does wind at the firing point... as does wind along the entire projectile path. I would be less worried about 1" of drift in the last 100 yards of trajectory than i would be about 1" of drift in the first 100 yards. Wind meters are great to give you an indication of wind speed at your location. You can use this information to make a slightly better informed decision about the effect of the wind along the bullets entire trajectory.
I have a kestrel 2500... it works well. I didn't bother getting one with all the bangs a whistles and truth be told i tend to use vegetation more than the kestral when judging wind effect. Norway put together a cool video demonstrating using vegetation to judge wind.
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