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This is a ruler with arc. It is designed to be a curved bottom. While drawing, it won't contact with the paper directly. By this way, the residue of last drawing ink on the ruler won't be rubbed and painted with the ruler's moving around.
The Curved Ruler is unlike the traditional ruler print the scale on the surface directly. It is designed to be a scale plane which is embedded in the ruler. So the scale won't fade during use. We can thereby draw more standard and the life of the ruler will be extended.
You don't need to worry about the line will be drawn crooked: The ruler itself is very thin,the impact on the painting is almost negligible.