Water Resistant: Water resistant watches are designed to withstand exposure to water. They are not waterproof, and should not be submerged in water for extended periods of time. Water resistant watches are marked with a symbol that indicates the level of water resistance. The most common levels are 30 meters (3 ATM or 3 bar), 50 meters (5 ATM or 5 bar), 100 meters (10 ATM or 10 bar), and 200 meters (20 ATM or 20 bar).