Multifunction nonstick ink ruler
RulerShenzhen Yunbo Industrial Design
This product solves several small problems that arise when using a conventional ruler. The slightly raised edge design prevents the ruler from being stained with ink, preventing smudges on the paper. Additionally, the slide bar design element makes it easy to use a compass to measure circle data. These are features that ordinary ruler does not have, making this product an improvement on the age-old ruler.