Heavy-duty, portable Pro-Pen marks metal, plastic, and wood surfaces that are machined, flat, concave, or circular. Built-in viewer, detachable keyboard, and integrated software eliminate need for separate PC. System inscribes 2.4 x 1.6 in. area with 0.04-1.2 in. characters in 0.01 in. increments. It runs off supplied battery pack or 110 or 220 Vac.