... # characters)Marking Depth0.01-2mm (depending on hardness of material)Marking Accuracy4μmImpact Frequency250 times/secondClick Frequency300 ± ... ≥ 0.01mmNeedle HardnessHRC 92Max. HardnessHRC 62Air Pressure 0.2-0 .6 Mpa (industrial gas source or compressor ... body, frame, chassis, connecting rod, engine, cylinder, and various mechanical parts, machine tools, hardware, metal pipes, gear, pump, valves ...