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The different of 20w,30w and 50w laser marking machine
Firstly,it is focuslaser machine watt.
20w can do simple surface marking.
30w can do faster surface marking,and deep engraving,thin metal cutting.
50w can do a little faster deep engraving and thin metal cutting work.
They use it to do deep engraving on gun firearm industry and jewelry industry,etc.,