Waterproof watches are usually divided according to their level: not waterproof (back cover unmarked), anti-sweat (SWEAT-RESISTANT), general waterproof (WATER-RESISTANT), 30 meters waterproof (30M, 3ATM, 3BAR), 50 meters waterproof (50M, 5ATM, 5BAR), diving watch 100m water resistant, waterproof 200 meters, 300 meters waterproof. But the premise of this standard is to perform this test under laboratory conditions: temperature was maintained at 20 to 25 degrees Celsius, and water were tested watches and stationary state.
Remember, in our daily living conditions, water standard of 30 meters, waterproof splash, can wear Wash hands and face; 50 m, you can use a small amount of cold water to wash, can not soak; 100 meters in the pool or sea surface use; more than 200 meters, it can dive.
In addition, water tables are not wearing any wash hot water bath, sauna or large temperature changes in the environment. Because waterproof apron will be affected by temperature, thermal expansion and contraction voids and accelerated aging causing water condensate, severe mechanical damage will occur in the water and tables.
For only the hours, minutes, seconds, the simplest function of the watch, you can adjust at any time; but as long as, calendar, week, moon phase, perpetual calendar watches with a calendar and more complex functions, never to 22:00 the next morning adjustable between 2 points. This period calendar ongoing operation, while the lower gear when heterozygosity frequent action will damage the internal parts of the watch, which is referred to in the jargon “sweep teeth,” watch will bring irreversible damage.