Those are great. The dial calipers came next and then digital. Since I'm in the calibration business, I always liked those types like micrometers - verniers. I know that the younger generation like digital, but you have to be careful when using them since they don't have a mechanical zero like the verniers. This means that you have to check zero before use. I had to teach this to several engineers, since most simply press the zero button and think they are good to go.
The bottom line is they all have pros and cons.
Vernier - not easy to read, but very reliable
Dial - easy to read, but the pinion gear can become clogged with debris if you are not careful.
Digital - easy to read and probably slightly more accurate than the other two, but requires a battery and zero check. Oh, another advantage is inch/metric button.
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