Check the listing for details. Stainless Steel Marking Machine 300W Electrochemical Etching Machine Metal. Condition: New. Listed at 373.35 USD. Electrocorrosion machining is based on electrochemical processes. Beautiful logo, high-grade product appearance. Marking Tools. And the production of stainless steel signs, shell marking, etc. The marking depth is between 6um and 100um;.