TUSA Japan releases in the Philippines - Solar dive computer on March 2015. World’s 1st TUSA M-Value* function. Divers still suffering decompression sickness even when diving within no-decompression limits. The type of dives that were made by Japan’s decompression sickness sufferers were at depths of 15m and times at 45 min or more. M-Value warning function alerts the diver or her body nitrogen pressure decompression at 95%, 90% and 80% (user programable).