Calibrationplate is also called: school tube plate, shipbuilding calibration plate , heavycalibration plate , calibration plate specially is used in the welding of largeequipment tablet (platform), with reasonable design, stable structure, highprecision, wear resistance, etc, which can realize 3000 mm - 6000 - mm plate joining together, the productis made by scraping or grinding.Calibration plate is widely used in machining,tool workshop, machine shop, large equipment base, measuring room and precisionprocessing of inspection, measuring and grinding, and the exact measurement,  testing the flatness of workpiece, flatnessand Angle tolerance values.