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Steamer,That's not a typical bore gage, that's a bore mic - good to within .0002" or better, nice! We have a couple of those here at work, they were not cheap.
One of the machinists at work gave me this today. I can’t tell you how good I feel about that. It goes way beyond that it’s a super gift. Can’t really explain it, but this gent is a really top machinist - he does some incredible things and I work very closely with him on a lot of projects. He gives me a lot of very good advice. He can be a bit surly with people but I realized as soon as I joined the company how skilled and how ingenious he is, and we hit it off quickly. Anyway, it’s a pressure micrometer. Never even seen one before. I guess it’s for delicate parts but I bet this will work really well with telescoping bore gauges.