Divers need watches that remain perfectly readable in harsh conditions. The Ball Engineer Master II Diver Chronograph manages to achieve that goal. Hands, markers, numerals and the interior bezel are illuminated through the use of 56 self-powered micro gas tubes that glow 100 times brighter than luminous paint and will keep on functioning for approximately 25 years. The watch is equipped with Swiss-made ETA 7750 automatic calibre that performs 28 800 vibrations per hour and has 25 bearing jewels. It is protected from shock, magnetic influences and water penetration. The chronograph is operable under water and will function at depths of up to 100 metres. Its accumulated measurements reach 12 hours. The elapsed time inner bezel is adjusted through a crown. Additional useful functionalities include a day and date display at 3 o'clock, screwed-in crown and scratch-resistant sapphire crystal glass with anti-reflective coating.