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This flat straight edge gauge stands out with its 00-grade top precision, the lowest flatness tolerance in the mainstream granite measuring tool series, ensuring consistent and reliable measurement results for long-term use. Its natural granite material has excellent thermal stability, not easy to deform under temperature changes or long-term loading, eliminating the deviation caused by metal tool fatigue. The surface is polished to a mirror-like finish with ultra-low roughness, reducing measurement friction and ensuring scratch-free contact with measured workpieces. It complies with international and domestic metrology standards, making it suitable for third-party inspection and calibration scenarios, and its modular packaging design facilitates easy transportation and storage.

The standard length specifications range from 500mm to 3000mm, with customized sizes available upon request. The cross-sectional dimensions are standardized at 40mm width × 60mm height for mainstream models, with a total weight ranging from 8kg (500mm length) to 48kg (3000mm length). It meets the 00-grade flatness tolerance specified in GB/T 20437-2006 and ASTM E740, with each product undergoing strict 100% inspection before leaving the factory. The surface has no cracks, air bubbles or other defects, ensuring long-term service life of more than 10 years under normal use.

This flat straight edge gauge is mainly used in the mechanical processing industry for detecting the flatness of machine tool worktables, calibrating assembly lines and positioning precision components. It is also widely used in electronic semiconductor manufacturing workshops for detecting the flatness of silicon wafer carriers, in the mold processing industry for checking the flatness of mold surfaces, and in the measurement room of quality inspection departments as a standard measuring tool for precision calibration. It is suitable for both laboratory precision detection and on-site industrial production inspection scenarios.