Basic principles Computer controls marking-needle to move on traces of pre-edited characters and graphs, meanwhile, to strike materials at a high frequency under the application of compressed air, thereby, to form needed characters and graphs. Major functions Software applicable on windows 98/2000/xp/vista platform, has strong editing functions, and easy to use, capable to mark chinese and english characters, arabic numbers and graphs, automatic marking serial numbers, international standard vin codes. The marking head could move 90 degree, suit for different marking requirement.