This is a 0.2 mm thick ruler from Three Sheeps Design, that's engraved with measurements for each scale of a scale model. The 1/12 to 1/48 scale shows measurements in two units; centimeters and inches, and the 1/72 to 1/700 scale shows measurements in the two units; meters and feet. It's useful for processing parts and grasping the sizes for additional work! Get yours today!