... Water cooling system 3.Diode pump laser 4.Mark on metal, plastic,rubber products Laser marking machineSampleTechnical parameters Input voltage:AC220V ... serial No., batch No., barcode, 2 -D code, etc. on metal or nonmetal surface (plastic, silicon or porcelain, etc.) which are ... industry, jewelry, glasses, auto parts, telecommunications products, plastic buttons etc. Metal laser marking machine with CE