What is what apple watch is waterproof?

Apple Watch Series 2 and later models have a water resistance rating of 50 meters under ISO standard 22810:2010, meaning they are suitable for shallow-water activities like swimming and showering. However, it is important to note that while the Apple Watch is water-resistant, it is not waterproof and should not be used for scuba diving or high-speed water activities. It is recommended to rinse the Apple Watch with fresh water after exposure to salt water or chlorine to prevent damage to the device. Additionally, the water resistance of the Apple Watch may diminish over time, so it is important to check for any signs of damage or wear and tear.