Auto-Measure several times before starting engraving.
Engrave your material. (If engraving a mirror--Use black card stock on base plate/ turn mirror upside down on wooden slates /popsicle sticks. Clean mirror to remove any fingerprints or oils. Wipe down with alcohol 99% front and back of surface before and after engraving.).
Paint Engrave areas on mirror with either Paint Pens or Sharpies.