... flatness not exceeding 3mmApplicable Scope: Motor part, Mechanical part, Machine tool, Hardware product, Valve, Pump valve, Electro-mechanical equipment, ... , etc.(2) Mechanical Industry: to marking on Mechanical Part, Machine tool, Hardware Product, Steel Tube, Sleeve, Collar, Roller, Pump ... 0.02-1.5mm (adjustable, relevant to material)Repeat Precision: 0.02-0.05mm (can mark English letters with ...