how to use vernier callipers. As much as you know, it gets more useful?

Hello, we're Tool Brothers.~
There's at least one Vernier Calipers at the scene.
There are probably people who know. There are probably people who are unfamiliar with it.~~
Many people are asking how to use Vernier Calipers.
I made a video like this!
To measure the outer diameter (outer diameter, thickness) inner diameter (inner diameter) depth of an object,
It's so convenient.~~