Quote Originally Posted by mklotz View Post
Yes, your self-correction is correct. Only the fact that the blocks have matching dimensions matters.

Thanks for remembering my name but that tool is properly called a "dial caliper", not a "vernier". The old style calipers that actually had a vernier scale, e.g.,

https://en.wikipedia.org/wiki/File:Vernier_caliper.svg

might be nicknamed "verniers" but the terminology for the more modern ones is "dial caliper" or "digital caliper" for the purely electronic style.
when I was apprentice many years ago we used to call it " calibre" thats the normal ones while the ones that did not had thin legs in the back to measure interior , and you had to use the front of the outside measuring legs , used to be called "pie de rey".Latter when I migrated to Australia found that they were called Vernier , maybe in reference to the vernier scale on it, and to differenciate between that tool ant what people at the time used to call calliper , a tool that was used to measure outside and inside diameters that is like a dividers with curved legs , and that I used to call "compas de gruesos"
again Marv, Thank you for your marvellous ideas , that help a lot of people , even old hands like me.
mariano