Quote Originally Posted by Steve Seebold View Post
Most folks don't have tools to check +/-.001 anyway. You can't consistently measure within .001 with a dial caliper, and there is absolutely no way you can accurately measure the inside of a hole with a caliper unless you do some math.
Which is why you use a micrometer and a telescoping hole gage. A granite surface plate, a height gage, a set of gage blocks, and a 0-4-0 DTI also allow measurements in the tenths range without too much work.

Not too hard to get tenths accuracy in measurement. All things that should be in your toolbox.

Some day I will stumble across a set of hole micrometers on craigslist and I can throw the telescoping gage in the bottom drawer. I don't like them, but not to the tune of dropping $600++.