Measuring cylinders bore

[Dukegonzo]

Howdy.
I’m looking for someone to point me in the right direction - I need to purchase a bore gauge, one that doesn’t break the bank and is right for these old twins. I have a digital micrometer already.
Any suggestions?

 

[LongDistanceRider]

This one or something similar should work fine https://www.ebay.com/itm/Mitutoyo-D...478193?hash=item4b7d0be2f1:g:6~cAAOSwbNte7SK~
It eliminates the learning curve of using a 2 point anvil type that also requires using a micrometer to get the measurement. Don't get the Harbor Freight ones if you're after accuracy.