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They're usually both an internal and external type: eg they can measure both the outside of a seatpost and the inside of the seat tube.
Yeah, handy to have both. The ones I have can measure depth as well with a little rod that extends past the end of the caliper which might be worth having if for some reason you need to measure the depth of a drilled hole or something accurately.
frankenbike
Rather pedantic of me, but it might avoid confusion later: "Vernier" and "digital" refers to the scale and not the type of caliper, so they are either Vernier or digital.
They're usually both an internal and external type: eg they can measure both the outside of a seatpost and the inside of the seat tube.