I use an impact for off and on but do the final tighten by hand. The problem is when people use impact and wail on them until it stops moving.

If I'm not using air for anything I use an electric one and it never over tightens unless you sit on it. I can always get a bit more out of it by hand.
With air I only do it till it stops and again it's never fully tight at that point and needs a bit more by hand.
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