Granite slab is made of natural stone materials, precision reference measurement tools, instruments, precision tools, machinery and parts of the test, is an ideal base level, granite slab, especially for high-precision measurements. After millions of years granite natural aging, organizational structure is even a very small linear expansion coefficient, internal stress disappear, no distortion, so high precision granite plate. Granite slab at the same time afraid of acid corrosion, no rust, easy to stick dust, maintenance and servicing is also very convenient and simple, life is very long. 
 Granite slab into 000,00,0,1-level accuracy, precision machining company is crossed, the ideal tool for testing. 

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