Frank, I’ve used Jon’s wall thickness gauge and find it repeatedly accurate and easy to use. The other two I have used, for me, are difficult to get repeated accuracy and for me, are harder to use.
Maybe his bore mic is no better than any others but I just think if he can make a wall thickness setup as user friendly as it is it just stands to reason that his bore mic must be a good one too. Just my opinion, but having experience with it, I think it’s a valid opinion.
YMMV
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"I'm a Setter man.
Not because I think they're better than the other breeds,
but because I'm a romantic - stuck on tradition - and to me, a Setter just "belongs" in the grouse picture."
George King, "That's Ruff", 2010 - a timeless classic.
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