Diamond Micro-Engraver Pen can be used to mark samples, engrave tools, indicate a sample area for finding in the SEM, deburring and so much more. Easy to handle and control, it will engrave --wood, metal, ceramic, glass and more. The micro engraver features a contoured grip for comfort and control and a precision-ground stainless steel bit with a diamond point tip. This diamond-tipped ballpoint micro engraver is also as small as a pen, so it easily fits in your pocket or purse for easy transport. Requires two AAA batteries, included