Multifunction nonstick ink ruler / Ruler and Pen

This product solves some small problems in the use of ruler. The slightly raised edge design prevents the ruler from being stained with ink when it is used, so as to avoid secondary pollution and paper contamination. The design of slide bar also facilitates the use of a compass to measure the data of the circle radius. These points are features that ordinary ruler can not have, and can well solve the troubles in the use of ruler and avoid the occurrence of these errors.