> My understanding of these is that they just lock in on the bore
> dimension, and then you still need a micrometer or caliper to
> translate "this big" to an actual number.
Right. In addition, it requires a good deal of both care and "feel" to get
them positioned just right in the bore. If they aren't held perfectly
positioned _while_ you tighten the screw, then the resulting measurement
will be wrong.
That said, I can't justify buying a proper bore gauge, so I have a set
similar to those shown. I keep taking measurements until I get 3 in a row
that agree ... which takes a surprising number of tries!
Moose, I'm not entirely sure what you are looking for, but IMO Enco has both
better quality and better prices than HF. Eg,
http://tinyurl.com/yjp22or
Randall
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