Bore Gages.....
 

I don't know if the threads are standard for dial bore
gages, but see
http://www.use-enco.com/CGI/INLMK3?PMK0NO=1151081
The price is right and these are on sale.
Enco has free shipping for orders 25$ or more through Friday
13 Aug. Ship code AUGR7

I ordered two of the dial bore gages last night and there was no place
to put in the free shipping code. I sent an inquiry to Enco but
haven't heard back, and probably won't until Monday. I'm wondering if
the free shipping won't apply to on line specials.

RWL