... Water cooling system 3.Diode pump laser 4.Mark on metal, plastic,rubber products Laser marking machineSampleTechnical parameters Input voltage: ... serial No., batch No., barcode, 2 -D code, etc. on metal or nonmetal surface (plastic, silicon or porcelain, etc.) which are ... diode laser module, scanner head, beam expander, reflect lens, Q-switch, Q-driver and other key parts imported from USA,UK, Singapore ...