20mm Oil Damped Luminous Escape & Evasion/Survival Kit Button Compass. New. Designed as an Escape & Evasion aid for pilots and Special Forces. 20mm in diameter, 7mm thick. Luminous cardinal point markers and luminous North pointer, enabling clear orientation in darkness. Domed clear acrylic glass housing with black ABS thermoplastic polymer base. Cardinal and intercardinal point markers and white 200 mils and red 800 mils calibration markings. Worldwide inclination balanced. Operating temperature range: -25C to +45C. Water resistant to 100ft (30m). Weight 3 grammes. A robust and cost effective design undergone testing in all environments (Jungle/Arctic/Temperate/Desert/Sea). Individually checked and tested for accuracy. Can be sewn into clothing or hidden on the body for concealment until required.