Turn a small drill press into a Bore/ Hone. Bolt it to the top of your engine block & do your own machining .

Rat Bastid said

Using a caliper to measure piston and bore size TO FINISH is laughable at best.

You‘d do just as well with a yard stick. Use the proper tools or don’t bother, unless you like junk.

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It would give him a good idea of were he is at
Ive seen real machinist's use dial calipers many times in the shop, I would think using an outside mike would be whats really should be used. The guy is using a mag drill to bore or hone his cylinders, I doubt he could afford a set of outside micrometers, hence my thoughts
I didn't know you were actually a machinist