Description Warranty Information Electric Arc Marking Pen Model 300. This self contained marking system utilizes an electric arc method to permanently mark any metal. Suitable for use on both ferrous and non-ferrous metals, either hard or soft. The electric arc method creates a permanent surface deformation that is clearly visible, is highly resistant to wear and can normally only be removed by grinding or machining. Ideal for marking parts, hand tools and many other applications. This Product comes with a 1 year Warranty