The diver watch bezel, also known as unidirectional bezel-a ring shaped object that surrounds the sapphire crystal, is a basic feature for diver watch. You can turn or rotate the bezel in a counterclockwise direction. On most divers watches, you can only turn the bezel in one direction. That’s why it’s called “unidirectional bezel”. It is the most simplest way to keep track of diving time. The diver watch bezel allows indicating the elapsed time or remaining time.

The reason why most divers watches use a unidirectional bezel is because this ensures even if you rotate the bezel accidentally, it can only increase the apparent elapsed time. In other words, a unidirectional bezel only turns one way to prevent any danger of false manoeuvre, which is meant to protect the diver’s life. This is a “fail safe” feature for a diver. Turn the bezel in the counterclockwise direction until the main marker or “zero” points at the minute hand. This represents the time you dived into the water. By reading the marker or the “zero” you can determine for how long you’ve been underwater.

Found in diving watches, the unidirectional rotating bezel is a unique feature that helps measure diving time in a handy and effective manner. Take replica Rolex Submariner for example, one of the most important features of the Submariner is the unidirectional bezel. The unidirectional bezel on each Submariner watch lets divers memorize immersion times. The bezel will only move in a counterclockwise direction, thus ensuring that the timing on the watch is kept under control. This especially helps divers to let them know how much time they are spending underwater and if they have to get out for any reason. A diver can easily keep track of the amount of time underwater with this feature.