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A dive bezel is the rotating ring on the outer edge of a dive watch, designed to help track elapsed time underwater. On most professional dive watches, it’s unidirectional, meaning it only turns counterclockwise. This is a safety feature: if the bezel is accidentally bumped, it will only shorten the indicated dive time rather than extend it, helping prevent a diver from overstaying their safe limits. The bezel typically has minute markings, with the first 15–20 minutes often highlighted for precision during critical phases of a dive.
To use it, a diver aligns the zero marker, often a triangle with a luminous pip, with the watch’s minute hand at the start of the dive. As time passes, the minute hand moves while the bezel stays fixed, making it easy to read elapsed time at a glance without doing mental math.
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It was originally meant to help divers keep track of their time under water. Nowadays, for the most part in professional settings these have been replaced by modern dive computers but regular watches can still be used.
You can mark the start of an event with the 0 marker on the dive bezel aligned to the minute hand. Let some time pass and now look at what the minute hand indicates on the dive bezel. If it indicates 20 it means 20 minutes have passed since starting the event. It is meant to be used to time in a dive but you can also use it to time anything that would fit within an hour, boiling eggs, taking a work break, etc.
This is a safety measure in case the bezel is accidentally turned while being actively used, in case that happens it will only shorten the indicated dive time rather than extend it, helping prevent a diver from overstaying their safe limits.
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