Type 'P' Ruler / Ruler

This is a ruler as type of pen. Existing products in the form of a thin rectangular plastic or steel, aluminum and other materials are. Typically, We need something like scale mark on stuff when we want to know some length. but the product forms as a ball pen, depending on the distance to be measured by length, and you can choose the length unit.This product does not require a grid of different things to find the length and shape. In addition, this product is portable. So you can know some lenth without existing ruler.