Tri-level scale: triangular / square foot rectangular test: Material and more stainless steel / steel / magnesium aluminum material, a few use cast iron. This product is made of T10A after quenching and tempering, the hardness after quenching is up to HRC58 ° -62 °, then its precision grinding, grinding manual after their grinding, so as to achieve precise parallelism and perpendicularity, and edge Department of straightness. Mainly used to measure the workpiece straightness and flatness, and rail inspection and repair. 

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