On setting up table saw tops and fences, here is a set-up gauge I made many moons back.

You can produce settings tight enough you cannot get a .001feeler gauge between the gauge and the item you’re setting up to, or setting up.

Because of its long, machinist’s ruler, it also proves useful for other work. For example, if I have to mark the bottom of a deep box on the box sides, or for marking nail points on the back of cabinets and so forth.

https://woodworkingweb.com/topics/214-table-saw-set-up-gauge