... batch number and 2D barcode.2,Tech Parameters HMD-50A jewelery Laser Marking Machine Output Power50W(adjustable)total Power Consumption ... products;-Buckle sign industry: buttons, luggage buckle, belt buckle, gold and silver ornaments, signs, badges, time cards, business cards, ... , zinc and all other metals), rare metals and alloys (gold, silver, titanium), metal oxide ( any kinds of metal oxide ...