The clicking sound you hear when you rotate a watch bezel is due to the design of the bezel mechanism. Underneath the bezel, there are usually a number of different parts that connect the component to the watch and provide it with both its motion and functionality.
In the case of dive watches, the bezel is designed to only turn in one direction (unidirectionally) to prevent accidentally adding to the dive time. When turning the bezel, you can hear firm clicks. This clicking mechanism is a safety feature to ensure that in case the bezel is accidentally moved, you’ll end up with more air in the tank than less.
The number of clicks can vary depending on the watch. For instance, 120 clicks is the industry standard for a timing bezel. The clicking sound provides tactile and auditory feedback, letting the wearer know that the bezel is securely set in place.
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