Compare to electrically powered marking system, pneumatic marking system are more stable and powerful. Adjustable marking depth allows different marking effects, suitable for all metal parts. Same as the electric marking system, pneumatic marking system also has the built-in programming system with an industrial microcomputer and multiple USB ports allows you to work without a computer. Able to mark in Chinese and English characters, Arabic numbers, automatic Serial numbers sequence, VIN code, QR code, etc.