In article , Craig wrote:

If you need the accuracy, they are great. We've got at least 30 Mohr
gage kits here at work. Our kits can cover everything from .128" all
the way up to .500". Kits consist of a digital head, various extension
pins and the necessary ball ends and check rings.

Ah. There are two basic kinds of these things.. they really do mimic the
small hole gages (with the ball-end) or the telescopic gages. The ones that
you use are the small-hole-gage type. I'm looking for something to do up to
6" or larger bores. That would be a big ball. 8-)

Don't know what the kits cost, but I believe that you can start with
just the head and one size set up.

You normally buy the ones of that style sized for a particular range,
like 0.100" to 0.250", that kind of thing. There are a few sizes listed in
my catalogue, running up to about 1.5", where the telescopic-gage-type takes
over.

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Mike Graham | Metalworker, rustic, part-time zealot.
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http://www.metalmangler.com| Caledon, Ontario, Canada