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Message: <blockquote data-quote="AllOut" data-source="post: 1847441" data-attributes="member: 12099">This^^^As a machinist I can tell you we are only as good as the tools we work with. A mic or caliper that has .0000000001 increments don't mean crap if they arnt calibrated, won't hole 0 or you don't know how to use them. Now, calipers especially digital are pretty idiot proof. But that don't help calibration. It's always a good idea to go ahead and buy a good precision 1" standard to check you calipers with, I'd check them every day you use them. Then if your using them for long periods of time I'd check them multiple time while in use.For me, I'm pretty good about holding stuff while reloading to +/- .001 (I'm an anal machinist). So that said my tools need to read in the thousands if not tenths.</blockquote>