... height: 200mmCooling way:Refrigeration unit cools the circulating media then the circulating media cools the laser cavity.Refrigerating power:1PRefrigeration unit: ... serial No., batch No., barcode, 2 -D code, etc. on metal or nonmetal surface (plastic, silicon or porcelain, etc.) which are ... , jewelry, glasses, auto parts, telecommunications products, plastic buttons etc. Metal marking machine with CE