Water and Dust Resistance: Apple Watch SE and Apple Watch Series 9 have a water resistance rating of 50 metres under ISO standard 22810:2010. This means that they may be used for shallow-water activities like swimming in a pool or ocean. Apple Watch SE and Apple Watch Series 9 should not be used for scuba diving or waterskiing, or other activities involving high-velocity water or submersion below shallow depth. Apple Watch Ultra 2 has a water resistance rating of 100 metres under ISO standard 22810. It may be used for recreational scuba diving (with a compatible third-party app from the App Store) to 40 metres, and high-speed water sports. It should not be used for diving below 40 metres. Water resistance is not a permanent condition and can diminish over time. For additional information, see . Series 9 and Ultra 2 are also rated IP6X dust–resistant.