... 1.Water cooling system 2.Diode pump laser 3.Mark on metal, plastic,rubber products 4.CNC ... ionized water, distilled water or purified water.•Feature:1. Diode pumped laser marking machine adopts high-quality semi-conductor module, life ... . Its mainly equipped with the international advanced semiconductor light-emitting diode. diode laser module, scanner head, beam expander, reflect lens, Q-switch, ...