Despite the fact the "boremaster" is not a bore gage, per se'..it's still a pretty useful tool and certainly convenient for limited measurements. (ie: 6" depth). Particularly for measuring wall thickness because obtaining wall thickness using a bore gage would require math after taking a measurement of the outside diameter (od). There is a modest degree of ingenuity in the gage as well because a caliper with extended jaws like that has a tendency to flex and skew the desired measurement due to the moving part of the gage not being beefed-up where it rides the beam. The inventor overcomes that variable (flex) by making the gage spring loaded which is conducive to consistent pressure. Not a bad gage for quick reference.
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