Ever wondered how to get a quick measure on scratches on parts?

Use your own thumb as a precision tool, similar to a ball scribe, to feel the depth of a scratch or ding.

If it doesn't catch your thumb, it's usually below 0.003” of an inch (0,07mm); if it does, it's above.

Simple, right?

Forget complicated methods, try this thumb trick for a quick estimate of scratch depth on precision parts.

Who knew your thumb could be such a precise instrument?

What are some other cool tricks you have for measuring things?

Let us know down in the replies below!

#measurement #manufacturing #fabrication #grownostr #DIY