The granite base bed is made by mechanical processing and manual precision grinding. Black luster, precise structure, uniform texture, good stability, high strength, high hardness, able to maintain high precision under heavy load and general temperature, and has the advantages of no rust, no magnetization, and no deformation.

1. Granite mechanical components have undergone long-term aging, with uniform organizational structure, linear expansion coefficient, disappearance of internal stress, and no deformation.

2. Good rigidity, high hardness, strong, and minimal temperature deformation.

3. Not afraid of acid and erosion, not rusting, no need to apply oil, not easy to stick to dust, easy to maintain and maintain, long service life.

4. No scratches will occur, not hindered by constant temperature conditions, and measurement accuracy can be maintained at room temperature.

5. Non magnetized, able to move smoothly during measurement, without any sluggishness, not affected by moisture, and with good flat stability.