SAFE RULER / SAFE RULER

People use rulers when cutting papers with knife to be tidy.
Knives are suitable with a paper but your hands are exposed to possible dangers.
I designed a protectable knife for your hand.
Installing a slanting pad at the front of the ruler, it will protect your hands and also the gradations are seen more clearly.
Moreover, there is a compass function at the tail end and the pad is slanted by a slope of fifty degrees, which is thickness of two fingers on average.
Adding a compass is to widen the floor area and also can fix the center of gravity and also can enhance it to be kept still.