Walters & Walters – Industrial Marking Specialists. PAINT-RITER+ Certified – Use on stainless steel or superalloys requiring prevention against corrosion, pitting or degradation. Formally known as Markal Certified Valve Action Paint Marker Pen. Available in 6 Standard Colours; Yellow, White, Red, Blue, Black & Green. Line width: 3 mm (1/8). Low Corrosion Marker Pen. Marking range: -50°F to 150°F (-46°C to 66°C). They contain a Low levels of Halogens, Sulphur & Chlorides. These pens are engineered to meet. All pens are batch certified to meet International & USA Nuclear and Military Specifications. Individual lot analysis & certification is available on the Markal Website. Great for use in the Aviation & Aerospace Industry, Welding and Power generation facilities. Fast Drying & Weather Resistant. Order before 11am for Same Day Despatch. Walters & Walters Ltd, your one stop shop for Industrial Marking – Check out our other items.