Here is a portable laser engraver that you can easily use on stainless steel, wood, glass, and leather. The WAINLUX Z4 has 4.5W laser power and auto lift focus. It comes with motion detection and overheat monitoring. The companion app supports various image formats (JPEG/JPG/GIF/BMP/PNG).
This laser engraver is compatible with iOS, Android, Mac, and Windows devices. It has a 50x50mm engravable area. It has a built-in shield to prevent exposure to harmful blue laser light.