Overview With the development of the times, the watch has water resistance (Water Resistant) has been generally recognized. For waterproof performance, the common expression is divided into two kinds, one is the waterproof depth (meters), one is the compressive value (unit marked: Bar or ATM), the relationship between the two is that each additional depth of 10 Meter, will increase the pressure equivalent to 1 atmosphere, namely: 1ATM = 10m waterproof. Waterproof watch on the performance of national standards and international standards have a clear rule: Where marked waterproof watch, the minimum to 2 atmospheric pressure, that is, 20 meters deep into the water. 30 meters waterproof watch that can withstand 3 atmospheres, and so on. The prerequisite for this standard is that the test is performed under laboratory conditions: the temperature is maintained at 20-25 degrees Celsius, and the watch and water are at rest. In this case the watch if it is waterproof, that is qualified. Waterproof depth of the actual embodiment of the general waterproof watches are divided into the following categories: 30 meters waterproof table can be used for daily grooming or rain, that is, water droplets splash on the surface without any pressure on the table; higher one Level, the most common is marked as 50 meters waterproof watch, can be used for general housework and shower; 100 meters waterproof watch can be swimming and snorkeling, and only reached or exceed 200 meters waterproof watch, was called the diving watch , Can carry out underwater diving activities. In life, wearing the arm of the watchmaker in the water greatly increases the pressure on the watch, so it can not be worn to the theoretical depth indicated by the lab tester. Waterproof principle In the watch's structure, the most important for the waterproof performance is the seal (O-ring). It is made of rubber, nylon or Teflon. A waterproof seal is formed at the junction between the crystal glass, the bottom cover and the crown and case. If it is a chronograph, its pushers will also have gaskets. Waterproof case lined with a sealer to prevent water leakage. At the same time, the thickness and material of the case can determine whether a watch can be safely worn underwater. It is noteworthy that, according to the rules issued by the Federal Trade Commission, watch retailers should not mark their watches as "completely waterproof." Even if the watch is designed for deep sea diving, it must not be declared completely waterproof. Waterproof watch is not permanent, subject to wear or time. The gasket may corrode or deform, the case may be damaged, or the crystal glass will loosen or crack. Dive for the mysterious ocean of curiosity and desire to conquer, so that many adventurers and even watchmakers at all costs into the study of the oceans. Diving watch is the true testimony and shocking result of this exploration process. The difference between waterproof watch and diving watch is that the waterproof watch is designed for everyday life, while the dive watch is a professional precision timepiece, to ensure a certain depth of compression has a certain degree of pressure to ensure that the real record time. Diving watch powerful features, uninhibited sports wind masculine appearance, as well as the significance of the exploration of the sea, so many men crazy. Structurally, diving watches tend to use threaded crowns to prevent water from penetrating through the holes. The crown tightens the watch to form a water-tight seal, just like the seal between a jar and a threaded cap. The gasket is made of a material that is resistant to helium from the diver's decompression chamber. Some have valves that the wearer can use to release the helium infiltrated into the watch so that the case does not explode when the watch and the diver adjust to normal atmospheric pressure. Common diving watch should also include: to measure the diving time of the rotating outer ring (with anti-rotating bezel design); easy to read in the dark time to luminous pointer and the time scale. Since the Rolex launched the first Oyster Table in 1926, a vast area of ​​diving watches has been opened. Since then, many watch brands have their own diving watch series, there are many watchmakers and brands began to professional diving agencies or the military to create high-performance diving watch, including the Navy to make diving meter since Of Panerai (Panerai) and so on. With the progress of science and technology, the super depth of diving is also the major watch brands make efforts to develop the project. On January 23, 1960 Trieste in the deep-sea submersible sank 10,916 meters below the surface of the sea with the Rolex in the Mariana Trench. This expedition to the unknown waters successfully rewritten the history of human conquest of the oceans . Today, 50 years later, this record has not been broken, the depth of dive unparalleled. As a result, it has become a milestone for mankind in exploring the deep-sea world. At the same time, it has also greatly enhanced the awareness of mankind's protection of the oceans. However, people in life have a hard time getting to the depths of more than 1,000 meters underwater, but this does not hinder people's enthusiasm and attention to the diving watch. The mystery and the longing for the ocean, as well as the high degree of integration of technology and mechanics, do not prevent them from becoming perfect collectibles even if they are not worn.
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