The best caliper is the one you have on you :-)

This quick print means you can take rough measurements whenever & wherever as it fits easily into any wallet. It has all the normal caliper features like a depth gauge, inner measurement pegs, and both metric and imperial units. The slide gently snaps closed.

I print these at .3mm layer height with a .4mm nozzle, although a smaller nozzle will increase the sharpness of the text. I recommend printing layers 2 and 4 in a contrasting color. Turning on “Ironing” will greatly increase the surface finish and slide smoothness (not pictured.)