The Seastar 2000 Professional is Tissot's most capable dive watch, certified to the ISO 6425 diving standard and water resistant to 600 meters. A helium escape valve on the 44mm stainless steel case lets it handle saturation diving, while a black ceramic ring on the unidirectional bezel resists scratches and fading. The dark gradient dial uses index markers and Super-LumiNova on both hands and markers for strong low-light legibility, with a date display. Inside is the Swiss Powermatic 80 automatic movement, storing up to 80 hours of power with a Nivachron balance spring for magnetic resistance. Screw-down crown and caseback, sapphire crystal with anti-reflective coating, and a quick-release stainless steel bracelet with a folding diver-extension clasp. Case thickness 15.29mm, 22mm lug width.