... on 24 working hours 3.CE 4.Easy operate Metal laser marking machineSampleTechnical parameters Input voltage:AC220V±20VFrequency:50HzInput power:1. ... ionized water, distilled water or purified water.·Feature:Diode pumped laser marking machine adopts high-quality semi-conductor module, life time ... jewelry, glasses, auto parts, telecommunications products, plastic buttons etc. Metal laser marking machine