Ed Huntress wrote:

A couple of the old timers I knew in the business, at Mitutoyo and Starrett,
didn't disguise their disdain for relying on ratchet thimbles. The general
opinion was that three different inexperienced users, all using the same
ratchet mike, would get three different readings off of the same part.

You still need some practice with the things to get consistent results.

--
Ed Huntress

Is there a measuring system where that isn't true? :^)

David