A uni-directional rotating bezel is a safety feature designed primarily for dive watches. It allows divers to measure elapsed time underwater by aligning the bezel's zero marker with the minute hand at the start of the dive. The bezel of this watch only turns counterclockwise to ensure that an accidental shortening of the measured time is impossible. The result is that the diver cannot end up staying underwater too long.
With clear numerals and minute indicators, the bezel is easy to read even in demanding situations. This characteristic makes dive watches stand out as constructed for function and robustness, as they appeal to both professional and enthusiastic divers who appreciate the design to an adequate functionality level.