Water meters are usually equipped with a Unidirectional Turing Dive Bezel. In addition to modern concepts of decoration and symbolizing sports life, the convex grains and clear and readable figures on the watches enable the wearer to accurately adjust diving and sports time, which is absolutely reliable. The outer ring only rotates in one direction. Even if it is accidentally rotated, the remaining movement time will only be shortened, but will not be prolonged to ensure safety. Usually, it is a one-way rotation to a certain scale (irreversible) so that the diver can determine the amount of oxygen required to return to the surface according to the instructions of the table.