marks on both smooth and rough materials, whether light or dark, rusty or oily, hot or ice cold, highly permanent, after a few minutes, high-contrast markings ? even on a dark background, weatherproof and light-resistant markings, ideal for outdoor use, variable line widths from 2 - 8 mm possible, in a protective case for one-handed operation, high-quality, smooth-running turning mechanism, chloride-free for markings on stainless steel, markings temperature-resistant up to approx. 1000 °C