... convenient to carry 4.WINDOWS operating system 5.directly mark Pneumatic Marking Machine Product DescriptionPneumatic marking machine is a mechanical application ... chassis and linkage, engine, cylinder, machinery and spare parts, machine tools, hardware products, metal, gears, pumps, valves, fasteners and their ... magnetic plug)Air pressure 0.2-0.7MPaImpact Frequency130-300HZ Pneumatic Marking Machine