Fowler cylinder bore guage?

These are my favorites. really nice to use. range of + or minus .005 total, down to the .0001. They are nice because the extra spring loaded plungers help center the gauge in the bore. I used to set these up when I worked in Quality...

http://www.ebay.com/itm/350693056727?ssPageName=STRK:MEWAX:IT&_trksid=p3984.m1423.l2649

These look ineresting...

http://www.ebay.com/itm/330859472174?ssPageName=STRK:MEWAX:IT&_trksid=p3984.m1423.l2649

These are the setting rings.

http://www.ebay.com/itm/ONE-Bore-Ga...233?pt=LH_DefaultDomain_0&hash=item20ce912549