... technical support Features: 1, The marking machine for steel plates serial number is automatically incremented and the ... parts, merchanism,petroleum,aeronautical and space,electric apparatus,steel,metal,non-metal and hard plastic materials.It mainly ... --- 999 optionalMarking Depth0.1 -- 1mm adjustableMarking Dirctionup,down,left,right,circle Marking Characterssizes,spacing for adjustment,character ...