Chem-Etch machine kit, cost effective, for good contrast in marking conductive metals In a small box, there are 1 hand stamp 20x40mm and the electrolytic unit; 100 blank stencils 75x56mm and a contact plate with cables and 2 liquids. Two models available, different in the power, from 30VA for 1030 to 60VA for E1250, and in the output, adjustable from 6 to 12V for E1250.