The original military watch, the H3 range utilises Gaseous Tritium Light Sources (GTLS) to make them the easiest watches in the world to see in low-light or zero-light conditions. No need to press any buttons or hold them up to the light, the H3 dial illuminates up to 100 times brighter than any other watch dial, so you can easily identify the time at a second's glance. These tritium light sources (which for many years were classified top secret technology and only available to active military personal) are tiny airtight vials, sealed under high pressure, and are resistant to water, oil and corrosive materials. A minute quantity of tritium lights up the dye. These properties make H3 watches an absolute must in emergency, safety and protection sectors as well as in the armed forces - and they are also idea for fans of adventure and sport.