... CHEMICAL MARKING MACHINEB-730 Metal Marking Machine A-830 Metal Marking Machine Technical ParameterModel A-830Display DigitalPrint Head 2Power Input ... steel sign or external casing marking.●The product's advantages are formal, clear, durable, non-discoloring ... materials, hard alloy, measuring tool, cutting tool, machine parts, instruments and meters, kitchen utensils, gears, bearings ...