The appearance of the marble square box looks like a square box made of marble . It is made of natural marble. The marble is recrystallized limestone. The limestone softens under high temperature and high pressure, and when the minerals contained in it change. Recrystallized to form marble .

The working surface of the marble square box generally adopts the precision grinding process . After the marble box is collided or scratched on the detection work surface , only pits will be generated, and no relief or burr will be produced, which will not have any effect on the measurement accuracy. The raw material of the marble box is natural stone, with good texture and hardness. High, can maintain high precision under heavy load . Therefore, the marble square box can still maintain the original accuracy after one year of storage . This is a unique feature of marble that other materials cannot match. The service life of the marble square box under the correct use and maintenance is still relatively long.

The marble square box is used to detect the flatness and verticality of parts, workpieces, machine tool tables, guide rails and precision work. It can also be used as a small workbench for a cushion box. The square box has the advantages of high precision, no rust, acid and alkali resistance, no magnetization, not easy to deform, and good wear resistance. Stable under heavy load and normal temperature.