BFF told be that her mom has a ruler with a non-slip grip. Then a light bulb went off. Hot glue tends to have the same effect. So I glued a thin layer of hot glue around the edge of my ruler and, voila! No more ruler slip!
I'm sure many other people have already thought of this, but I thought I'd throw it out there just in case.

That is awesome! Thanks for sharing. I never thought of that!
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