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.

The compass is composed of a pen head, a rotary shaft, a compass leg, a ruler, a folding leaf, a pen body, a pen tip, a compass tip, and a small ear. The lower end of the pen head is inserted and connected at the upper end of the pen body, the lower end of the pen body is threaded at the upper end of the pen tip, the flush end of the small ear is welded at the middle of the outer side of the compass leg, and the lower end of the compass leg is clamped and connected at the upper end of the compass tip.