Fisher Space Pen Cap-O-Matic Chrome with PR4 Black Ink Cartridge

The Cap-O-Matic Space Pen is a 5.13″ chrome pen with a pocket clip designed to write upside down, at any angle, underwater, over grease, and in extreme temperatures. It uses a Fisher PR4 black ink cartridge with a medium point. The pressurized ink system allows the pen to function in conditions where standard ballpoints fail—overhead work, wet surfaces, oily or contaminated environments, and temperature extremes from below freezing to well above room temperature.