Marking pen tool - GIF

Marking pen tool.

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Previously:

Autonomous line marking robot - GIF
Brass wheel marking gauge - video
Carpentry angle marking techniques - GIFs
Center marking jig - video

Probably good for low accuracy stuff like wood. I have a set of long punches of a few dozen different diameters that I could put in there for a much more precise mark. If you get the right diameter punch that's very tight on the hole you can usually get within 10 thou. Good for machining. Maybe not necessary for building a house.