The concept of Y ruler come from ancient brass goniometer. It is created to measure angle precisely and assist user to do sketching on drawing table professionally.

The fulcrum of a normal goniometer is made of a rotatable nail, it is easy to move around however hard to fix at certain point firmly. We re-design the goniometer by adding a magnetic system in the ruler. Y ruler is made of 2 main parts, protractor(body) and arm is engraved from same block of aluminum, light but strong, the magnets in Y ruler stick the parts together. This design makes Y ruler rotate smoothly and also stay firmly when user want to do drawing in certain angle. You will find well balance of movement when turning the protractor(body).

Moreover, a glass with engraved center point sit in the body of Y ruler, allows user to mark their center point easily which a normal protractor couldn't do it. And the clear glass will not hinder users' sight while drawing.

One arm of Y ruler is engraved with 12cm and 24 holes, while one is engraved 5inch. The arm design of Y ruler allows user to measure and corner rounder 60mm - 290mm in diameter.

The simple design of Y ruler enhance the whole drawing experience for professionals.