<P> Most manufacturers recommend divers to have their diving watch pressure tested by an authorized service and repair facility annually or every two to three years and have the seals replaced . </P> <P> Watches are often classified by watch manufacturers by their degree of water resistance which, due to the absence of official classification standards, roughly translates to the following (1 metre ≈ 3.29 feet). These vagueries have since been superseded by ISO 22810: 2010, in which "any watch on the market sold as water - resistant must satisfy ISO 22810--regardless of the brand ." </P> <Table> <Tr> <Th> Water resistance rating </Th> <Th> Suitability </Th> <Th> Remarks </Th> </Tr> <Tr> <Td> Water Resistant 3 atm or 30 m </Td> <Td> Suitable for everyday use . Splash / rain resistant . </Td> <Td> Not suitable for showering, bathing, swimming, snorkeling, water related work, fishing, and diving . </Td> </Tr> <Tr> <Td> Water Resistant 5 atm or 50 m </Td> <Td> Suitable for swimming, white water rafting, and fishing . </Td> <Td> Not suitable for diving and snorkeling . </Td> </Tr> <Tr> <Td> Water Resistant 10 atm or 100 m </Td> <Td> Suitable for recreational surfing, swimming, snorkeling, sailing and water sports . </Td> <Td> Not suitable for diving . </Td> </Tr> <Tr> <Td> Water Resistant 20 atm or 200 m </Td> <Td> Suitable for professional marine activity, serious surface water sports and skin diving . </Td> <Td> Suitable for skin diving . </Td> </Tr> <Tr> <Td> Diver's 100 m </Td> <Td> Minimum ISO standard (ISO 6425) for scuba diving at depths not suitable for saturation diving . </Td> <Td> Diver's 100 m and 150 m watches are generally old (er) watches . </Td> </Tr> <Tr> <Td> Diver's 200 m or 300 m </Td> <Td> Suitable for scuba diving at depths not suitable for saturation diving . </Td> <Td> Typical ratings for contemporary diver's watches . </Td> </Tr> <Tr> <Td> Diver's 300 m for mixed - gas diving </Td> <Td> Suitable for saturation diving (helium enriched environment). </Td> <Td> Watches designed for mixed - gas diving will have the DIVER'S WATCH xxx M FOR MIXED - GAS DIVING additional marking to point this out . </Td> </Tr> </Table> <Tr> <Th> Water resistance rating </Th> <Th> Suitability </Th> <Th> Remarks </Th> </Tr>

What does 3 atm water resistant mean on a watch
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