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If you are not absolutely sure of why you're getting anything else, just get one of the cheap digital ones ~£10. The ability to zero at any point plus the unambiguous display and usually switch-able units make them a no-brainer compared with a conventional vernier scale. This from a tart who is about to get a Mitutoyo mechanical micrometer with a vernier scale, but I will still do 90% of my measuring with a cheap no-brand digital caliper.
gbj_tester
My ones at home do, I think, but the Park ones are harder to read manually. There's no mark on the scale, you kinda have to just follow the line of the arm up to the scale, not very accurate.
Think I might invest in a nice manual set for at home.
Dial ones good for added precision or is the dial just likely to be another source of unreliability?