The ruler with an edge

Zero point ruler comes in lengths of 15cm, 20cm and 30cm.

With a simple edge at zero point, every line drawing using the ruler would always start at zero. It eliminates parallax error when you begin to start drawing at zero.

Zero point ruler best works with a sharp pencil, mechanical pencil or a pen. Simply land the tip at the edge and you are assured to begin at zero without taking too much time finding the starting point.