Water Resistance
All Sea Surfer watches display the level of water resistance of your watch on the back of the case. In the marking it will either note the ATM or Meters the watch is tested to DIN industry standards.
The ATMs or meters are only there to describe the different levels of water resistance as expressed in meters, in theory. The ATMs or meters stated refer to the depth at which a watch will keep out water, if both watch and the water do not move. These conditions, of course, are never met in the real world. In reality, the movement of the person's arm in the water increases the pressure on the watch dramatically; thefeore do not wear the watch to the depths indicated by the testing machines.
How to care for a water resistant watch
Keep your watch away from extreme high temperature changes, for example, hot shower, sauna or hot tub. The exposure to the heat causes the metal parts to expand at a different rate than the rubber rings that protect your watch from water. This creates gaps in the structure that may allow water droplets to enter the watch. Sudden temperature changes are undesirable. So do not immediately enter into cold temperatures after wearing your watch in heat.
After swimming or diving in salt water, immediately rinse the watch with fresh water. To prevent salt buildup and corrosion of a rotating bezel, turn the bezel several times while rinsing it. Heavily chlorinated water can cause problems, as can spray-on perfumes and hairsprays, so do not let your watch come into contact with such chemicals. Leather straps are easily damaged by frequent exposure to water. If you are going to wear your watch while swimming or taking a shower, a metal, rubber or nylon band might be suitable for you.