The compass has automatic lead core and pen clip. Automatic lead core type, press out core, no need to adjust, easy to use. Any pen can be clamped and the position can be customized. The compass has smooth lines and accurate drawing. It supports transparent square design, which makes it easier to identify right angles.

The student test ruler set has 8 sets of drawings, one set contains the tools required for the test drawing to help the examination room play. Transparent material, clear scale, more intuitive and accurate reading data, easy to complete measurement and drawing. The material is durable and not easy to be damaged. The design of anti-slip grip, pressing lead, and stable coarse pin let you draw smoothly.