The outer ring has many numbers and calibration marks and can be moved around the face of the watch. what is it for and how do I use it?
If there numbers appear as is minutes, then its a diving function on the watch, from the days when there were no dive computers. However it is useful as a safety backup. So when diving you plan your dive then dive your plan. If you enter the water on a planned 20 minute dive at 10:10, then you set the 60 minute marker to 10:30 to show the time your dive is ending, and then during the dive track the progress of the minute hand toward that marker, but be coming up to end at 10:30.
Hope this helps.....
The numbered bezel can be used by divers to measure elapsed time on their oxygen supply. Place the zero where the minute hand is now and you'll know when 20 or 30 minutes have passed when the minute hand reaches bezel number 20 or 30.
In the same way, you can use the bezel to tell when 30 minutes have passed on your parking meter if you simply put the 0 on the minute hand when you leave the car. When the minute hand reaches the 30 mark, a half hour will have passed.
Typically, the bezel only turns counterclockwise to keep the wearer from bumping and changing the elapsed time number. On some less expensive watches, the numbered bezel does not turn and is decorative only.
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