Product Description Precision 00 grade Black Granite Parallel Gauge Level Ruler Marble Measuring Tools Calibration Granite leveling rulers are also known as granite straight ruler,granite leveling rulers are manufactured according to International standard to ensure the high quality.The products are always made into ribbed plate or box-type, our company use the scraping process to improve the precision of the products. Since the products are customized, so the customers can customize the size according to the actual needs. Therefore, precision black granite leveling ruler export to foreign countries is popular in all the world. Product name precision black granite leveling ruler export to foreign countries Material Jinan Green Granite Proportion 2970-3070 Kg/m² Compressive Strength 245-254 Kg/m² Modulus of Elasticity 1.27-1.47N/mm² Linear Expansion Coefficient 4.6×10-6/℃ Water Absorption 0.13% The Hardness HS70 Usage A. As a precision reference measurement tool B. Measure the flatness, straightness of machine table, rail and precision plate Package wooden box Granite precision Class Granite paraller ruler are mainly used in testing the flatness and perpendicularity working -surfaces of the parts. Precision has 000. 00, 0, grade what is granite ? We using Jinan black granite stone for granite series instruments. it is have high quality .Due to the high precision,long duration,good stability and corrosion resistance,they have been more and more used in product inspection of modern industry and scientific areas as mechinary space and scientific researches Physical characteristics, Specific gravity,2970----3070kg Compressive strength,245---254N Coefficient of linear expansion.4.6×10~6°C Water absorption,0.13% Shore hardness,more than Hs70 Detailed Images OEM DESIGN Size Information Size Chart of This Design

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