Marble square foot measurement of the workpiece straightness and flatness and equipment installation. Flatness, straightness of machine table, guides and precision work. Made of granite square foot Jinan Green marble square foot is black gloss, structural precision, uniform texture, good stability, high strength, high hardness. Granite square foot is made of natural stone materials, precision reference measurement tools, instrumentation, precision tools, machinery, parts inspection, is an ideal base level, especially for high-precision measurements. 
 Marble square foot based on the underground quality of the rock layer, after millions of years of natural aging, the shape is very stable, do not worry deformed due to the conventional temperature difference. Marble flat feet through rigorous physical testing and selection of marble material, fine crystalline, hard texture. Marble Department of non-metallic materials, no magnetic response, there is no plastic deformation. Its high hardness, and therefore to maintain good accuracy. Marble square foot rock tools in use even if heavy objects bump up out a few grains of stone ballast. Marble square foot better than the precision measurement of high-quality cast iron and steel production base parts, to obtain high and stable accuracy. I produced the granite flat foot, the resting place for one year, to maintain the original accuracy of the same. 
 Marble flat foot characteristics and advantages: 
 1, the rock by a long-term natural aging, organizational structure is even a very small expansion coefficient, internal stress completely disappeared, and no deformation, so the accuracy is high. 
 2, good rigidity, high hardness, wear resistant. 
 3, not afraid of acid, alkaline liquid material erosion, and will not rust, do not need oiling, easy to stick dust, maintenance, easy maintenance, long service life. 
 4, no scratches, not a constant temperature to prevent temperature measurement accuracy can be maintained at room temperature. 
 5, magnetization measurements can move smoothly, Zhise sense, free from damp impact, good flatness.