The granite platform granite platform, also known as the granite slab, granite platform flatness inspection, and in the past have not the same concept no longer blindly pursue the point of contact of the granite platform in use. general use of the focus on the inspection of flatness can be due to continuous increase of the workpiece and the granite platform specifications, the requirements of the workpiece on the granite platform is changing, granite processing costs of the platform point of contact and granite platform has a great relationship, therefore, wise to the user is no longer deliberately require granite platform point of contact. 

 Granite platform made of: natural stone, "Jinan Qing", also known as "green" marble platform of the main mineral composition of pyroxene, plagioclase, minor olivine, biotite, and trace magnetite, black color, structure, precision granite based quality of the rock layer on the ground after millions of years of natural aging, form extremely stable, do not worry deformed due to the conventional temperature difference. 
 A granite platform organizational structure is dense, smooth surface wear, and small roughness values; 
 (2) granite by a long-term natural aging, internal stress completely disappeared, material stability, not deformed; 
 (3) acid and alkali resistance, corrosion, anti-magnetic; 
 (4) does not damp rust, use, easy to maintain; 
 5 linear expansion coefficient, little affected by temperature; 
 6. The face by a bump or scratch, only the pits, does not produce a convex pattern, glitch, had no effect on the measurement accuracy.