Bent metal ruler
I’m not that overly protective of my tools. Which I think is probably mainly due to the fact that I don’t own many high end tools, but mostly mediocre and budget equipment. But I’m getting more and more sympathetic to Julio, the older my kids get and the more I let them play with my tools. I’m down two measuring tapes, two flashlights and one ruler (which made me think about this whole thing now).
Fortunately they didn’t break my circular saw yet! Haha, just kidding!! I don’t own a circular saw.