Metal marking machine 1.Water cooling system 2.Diode pump laser 3.Mark on metal, plastic,rubber products 4.CNC control Metal marking ... distilled water or purified water.·Feature:Diode pumped laser marking machine adopts high-quality semi-conductor module, life time over ... auto-coding, serial No., batch No., barcode, 2 -D code, etc. on metal or nonmetal surface (plastic, silicon or porcelain, etc.) ...