This is laser marking on copper  impeller  of spare part for pump

 Laser marking on metal, such as stainless, iron, copper, aluminum etc

If can offer me the sample , and we will test for you  with 2 working days .

Difference material , difference paramter setting in software,  that is why we need test.

Any doubt and requires,  pls feel free to contact.  Mobile:+86-13566867226