First of all, I admit that I have not really dived the oxygen tank, which is the so-called "scuba diving." Single said at this stage of my understanding of this issue: diving table bezel number 0-60 (although you usually do not see the two numbers 0 and 60), manually turn the bezel before the dive dive the triangle fluorescent point To the position of the wrist watch minutes to go, then the watch becomes a 60-minute timer. It is said that the diving oxygen bottle is usually only maintained for 45 minutes of gas supply, and diving can not immediately water, so as to avoid suffering from decompression sickness. Well, it is estimated that in the time to 40 minutes when it is time to prepare the water. Here to emphasize the professional diving watch must have a "safety design" is that the bezel can only be one-way rotation (counterclockwise rotation, can not rotate clockwise). This design is to prevent accidental encounter when the bezel is diving, will only remind you to advance the water, will not cause you to delay the water, to ensure the safety of life. So there are some higher coffee table dive watch with bezel lock, as long as the bezel lock will not appear bezel turn around situation.
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