... testing report from National product quality & control bureau: NPQC No.3. 200150013, as well as via of testing report from ... engraving area, can engraving whatever plane or bend surface, No noise, No smell, No dust, and you can use it anywhere. It ... the laser engraving product, besides, with clearly, enduring, no change color, no fall off, withstand a high temperature , and anti-organic solvent scours ...