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We use a 0.2mm thick feeler gauge,measure the flatness of materials on the workbench.Materials that have not undergone leveling treatment have poor flatness.The surface of the material is not smooth,wrap kraft paper through a leveling machine.Avoid scratching the internal structure of the leveling machine.This is an LT-100 leveling machine that has been in service for 4 years.After material leveling,we use a 0.08mm thick feeler gauge,measure the leveling effect.