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ANGLE RULER is a ruler which can draw angle. In the daily learning life, we often need to draw angle and the most commonly used is the triangle belts of 30 °, 45 ° and 60 °. However, it's inconvenient to carry such kind of triangle belts and if you do not have them , you can not draw an accurate angles. ANGLE RULER can solve this problem. ANGLE RULER has three slides, corresponding to 30 °, 45 ° and 60 ° three angle. When you want to draw an angle, just need to push the corresponding slide, you can draw an accurate angle.
Qin Huangdao, China