Office Petals Roller Scales Rolling Ruler 15 cm Ruler Ruler Measuring, Drafting, School/Office Ruler  (Set of 1, Transparent)

1 Pieces measuring rolling ruler, drawing roller ruler, parallel ruler, multifunctional drawing design ruler for measuring, drafting, student, school and office,10 inches Features: The measuring ruler can be applied to multi-functional drawing, including quadrants, squares circles, angles, crosshatching, and vertical and horizontal parallel lines. It is with protractor, sliding roller, parallel scale, circle, auxiliary drawing. This measuring ruler with clear scale and transparent ruler surface. How to use: The use of protractor: Align the center of the protractor on the edge of the ruler with the vertex of the surveying foot, and at the same time, coincide the scale of the protractor with the datum line, then various angles can be measured on the edge of the ruler. Draw the arc and curve: Insert the pen into the small hole at the ruler end to make the center of the circle, insert another pen into another hole and rotate the ruler body 360° to draw a circle. If the radius between the 2 holes is different or the rotation ruler body is different, different circles or arcs can be obtained. Draw a horizontal parallel line: Press your hand on the ruler body, draw a horizontal line along the edge of the ruler, and then move the ruler up and down to draw a parallel line. Draw a vertical parallel line: Insert the pen into the small hole on the edge of the ruler, slide the ruler up and down to draw a vertical parallel line. The distance between the vertical lines can be measured directly. Specifications: Size: length 10 inches/ 15 cm, width 2.36 inches/ 6 cm Material: plastic Color: transparent