Diving Computers and Instruments. A dive computer, personal decompression computer or decompression meter is a device used by an underwater diver to measure the time and depth during a dive and use this data to calculate and display an ascent profile which according to the programmed decompression algorithm, will give a low risk of decompression sickness. Most dive computers use real-time ambient pressure input to a decompression algorithm to indicate the remaining time to the no-stop limit, and after that has passed,


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