[dapperdrake]

There is also the Vernier scale on certain styles of mechanical calipers.

[glkindlmann]

I love the Vernier scales! But I honestly hadn't known about the sense in which slide rules have a Venier scale until your comment, which led me to [1]. In another class on laser-cutting I had students make a kerf-meter, which became more accurate with a Vernier scale.

[1] https://dram.page/p/slide-rule-vernier/

[kqr]

Oh my God that is so clever. Thanks for sharing!