The water-repellent depth is mostly indicated between the pointer axis and the 6 o'clock position, such as 30 ATM, 300m or 300meters for waterproofing 300 meters, or Water Resistance and Waterproof for the back cover. Usually the warranty or instruction manual of the watch has the following words: waterproof 30 meters, only anti-washing splash; waterproof 100 meters for snorkeling or swimming; water 200 meters for scuba diving. These instructions seem clear, but blurred, just like the depth of scuba diving is only 30 meters, why do you need a table with a waterproof depth of 200 meters? Since the waterproof is up to 30 meters, why can't I take a bath with a watch? How to interpret the meaning of it is a university question!
When the underwater depth is increased by 10 meters, it will increase the pressure equivalent to one atmosphere. According to this principle, the general watch factory uses the pressure gauge to test the waterproof performance of the watch, so some watch manufacturers will mark the compressive value ( Bar or atm) to indicate its waterproof value. 1bar is equal to 1 kilogram per 1 square centimeter, so the pressure of 10bar is equivalent to the pressure that can withstand the depth of 100 meters below the water surface, that is, waterproof 100 meters, 20bar is equivalent to waterproof 200 meters, and so on. If the watch is only Water Resistance and there is no numerical indication, it is 20 meters waterproof according to international standards. However, the so-called stress test is static. When the watch is worn between the wrist or swimming, the pressure is dynamic. Therefore, the instantaneous pressure required by the watch is much greater than the static time, so it must be multiplied. The safety factor is doubled to ensure the waterproof performance of the watch, which is why the depth of the watch is much higher than the actual use.
The easiest way to distinguish the waterproof performance of a watch is to judge by shape: in general, the circular watch is the best waterproof, followed by the oval watch. The waterproof of the square or irregular watch is worse, because The waterproof apron and the round are the closest. Secondly, the material also has a relationship, copper, aluminum or gold-coated materials will deteriorate for a long time, which will affect the waterproof. In addition, the crown, the back cover and the edge of the glass are the main places for water intake, so the design of the watch itself has an absolute influence, for example, it has a screw-in crown and a rear bottom cover, a bezel design, and a shape. Thick models usually have better waterproof function; ultra-thin watches are not waterproof enough due to limited space, so the waterproofness is poor; and the multi-function design is easy to be leaky. In addition to its own design factors, improper use is the main culprit in the water intake of the watch. For example, after adjusting the time, the faucet is not tightened; the watch is prone to fogging under the condition of high temperature and low temperature; in addition, wearing a watch to take a bath, There may be no problems at first, and after a while, the watch will definitely have problems. When the watch encounters the problem of water ingress, it is best to send it to the watch shop by the professional master for the treatment of the movement of the movement or the drying of the case. It is best not to blow it dry by the hair dryer when the machine is not taken out. The move not only does not help, but it is easy to leave the evaporated moisture inside the movement, the problem will be more serious, and friends who have this habit should pay attention to it.
Finally, we must remind consumers that whether it is a professional diving watch or a general waterproof watch that emphasizes the waterproof performance repeatedly, after a long period of sun and rain and no regular maintenance and cleaning, dirt and dust will make the waterproof rubber ring and even the case become more and more aging. It has a serious impact on waterproof performance, and usually the waterproof guarantee of most brand diving watches is only 1 year, so regular inspection is very important. In addition, although the international organization ISO has strict regulations and tests on the waterproof marking of diving watches, because the specifications of the waterproof markings are not consistent in various countries, consumers may wish to waterproof the watch if they cannot distinguish whether they meet the requirements. Marking as a reference data, and not as a true depth of use, should be very safe.
