If I had to have only one type- and no micrometers- I would use a dial indicator and guage blocks. If you want 2.456 -use the guage blocks to stack up as close as you can- adjust the dial to your guage blocks, then remeasure until -You- are consistent, and then make your readings. You would be suprised how well this can be make to work if needed
I was told that digital indicators were more accurate than dials...
Oh, and I'm left handed so I always have to read it upside down........... Does anyone make left handed calipers or mikes?
As for accuracy; my Mitutoyo digitals have always been spot on when comparing with a mike or gauge block. You do have to develop a 'feel' for it; sometimes I convince myself that I can interpolate within the resolution by the feel and the way the digits change with differing pressure. Am I imagining things?