A diving watch is a specially designed watch used for underwater diving that has a minimium key feature that it is able to be water resistance to a depth greater than 10 ATM, which is the equivalent of 100 meters (330 feet).
The typical diver's watch will have a water resistance of around 20 to 30 ATM which is 200 - 300 meters (660 - 990 feet), though modern technology allows diving watches that can go beyond and much deeper. A true diver's watch is in accordance with ISO 6425, which defines test standards and features for watches suitable for diving with underwater breathing apparatus in depths of 100 m or more. Watches conforming to ISO 6425 are marked with the word DIVER'S to distinguish diving watches from look a like watches that are not suitable for actual scuba diving.
