Mark your Rulers

I use nail polish on the "non cutting" side of my rulers. This is a quick way to mark my rulers to distinguish my rulers from other quilters without obscuring any of the markings on the ruler. There is such a vast selection of colored nail polish available, that having the same color as someone else is unlikely. One bottle should be able to mark all your rulers. A dollar store near you would have a variety of colors or use nail polish you already own.