... may be)Marking Accuracy4μmClick Frequency300 ± 10HzAdjust Range≥ 0.01mmNeedle HardnessHRA92Gas Source0.3-0 .8 Mpa (industrial gas source ... , chassis, connecting rod, engine, cylinder, and various mechanical parts, machine tools, hardware, metal pipes, gear, pump, valves, fasteners, and ... , etc. Applicable material: metal, glass, ceramic, plastic, etc. pneumatic marking machine for metal and nonmetal