مسطرة دوارة بلاستيكية متعددة الوظائف بقياس 12 بوصة للرسم، مسطرة دوارة لرسم الخطوط المتوازية والدوائر وقوس التصميم

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. 

To 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. To Draw 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. 

To Draw 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: 

Material: Plastic 

Color: Clear 

Length: 12 inch 

Width: 2.4inch 

Package Included: 

1 x Measuring Rolling Ruler 

Note:

1. The color maybe tiny different from the picture because of the photograph. 

2. Please allow a little bit of size deviation due to manual measurement.