Originally Posted by gale
They sell sandpaper dots that are sticky on the back. You just stick them to the back of the ruler. But they will obscure some measurements so keep that in mind.
I have put them on certain rulers like the wedge rulers in places they will not obscure, you can also find some clear sheets that can be cut to fit the back of the rulers. Someone can tell you the name of it. I dont' know as I have not used it.