Measuring Rolling Ruler 30cm Various Formulas Horizontal Vertical Parallel Lines Arc Curves Drawing Roller Ruler white

Measuring Rolling Ruler 30cm Various Formulas Horizontal Vertical Parallel Lines Arc Curves Drawing Roller Ruler white.Feature: 1. Wide Range of Uses: Universal measuring ruler can draw the desired figure with protractor, you can draw arc curves, horizontal and vertical parallel lines, the size is enough to draw. 2. Design Details: One round hole per centimeter exist on this measuring roller ruler, convenient for drawing circles and ellipses. 3. Various Formulas: There are various formulas on th