I have this gauge, what's it for? It stands about two inches tall. It says Lufkin, and Made in USA, but no other markings on it. It must measure the depth of a hole or something similar I think, because the zero mark is in the fully extended position. Any help to be had?
Here are the markings on the side of the tool.
View attachment 1716267918
This is what it looks like in the zero position.
View attachment 1716267917
And here's what it looks from the bottom, fully retracted.
View attachment 1716267919