... of metals 2. Continuous work on 24 h 3.CE Approved 4.Easy operate Laser date marking machineSampleTechnical parameters Input voltage:AC220V ... -coding, serial No., batch No., barcode, 2 -D code, etc. on metal or nonmetal surface (plastic, silicon or porcelain, etc.) which ... , jewelry, glasses, auto parts, telecommunications products, plastic buttons etc. Laser date marking machine