... Product Description ETL-LG04 3D laser glass engraving machine, the output laser wave length is 532 nm green laser, after focusing, the diameter ... fit for the anti-fake of glass products, can engraving at the interlayer of the glasses, permanent, has the ... randomly.ETL-LG04 YAG green laser engraving machine, adopting the patent technology, we choose the latest laser crystalloid NdGdVO4,has very high ...