Seac Apnea Dive ComputerApnea Dive Computer MSST function: (minimum suggested surface time). Dive ascent speeds, temperature, total dive time, and depth, all on the same screen. LCD screen with adjustable contrast and backlighting intensity. Illuminated and sound alarms can be deactivated. Pedometer. Steel ring nut: Sturdy steel ring nut. No break rubber strap. Algorithm specifically for freediving: The Freediving algorithm helps prevent the occurrence of Taravana, and