Waterproof watch is usually classified according to their level is 30 meters, 50 meters, 100 meters, etc., the main surface, the back cover, the surface of the waterproof apron to achieve the appropriate waterproof standards. 30 meters (3ATM, that is, 3 atmospheres) waterproof watch can be used for daily grooming or rain, that is, water droplets splash on the surface without any pressure on the table. 50 meters waterproof table can be suitable for swimming and general housework, 100 meters waterproof table can be used for swimming and diving and other underwater work. General waterproof table should not be hot water bath, sauna, or great temperature changes in the environment. Because the waterproof rubber ring affected by the temperature will be expansion and contraction of cold expansion and accelerated aging and thus affect the waterproof function. And around the relatively small molecules of water vapor, it is easy to infiltrate the body, causing internal mechanical damage. Watch should be kept in the normal position, screw thread should be tightened, do not adjust the water table. Even a professional waterproof watch its waterproof apron should be replaced in time after a year, otherwise its waterproof performance will not be guaranteed. Quartz watch each time you change the best battery at the same time waterproof parts to ensure good waterproof performance.