Which Apple Watch for a Swimmer: What $249, $399 and $799 Each Cover in the Water

If you swim, buy Apple Watch Series 12 from $399. It is the cheapest Apple Watch with a depth gauge and a water temperature sensor, and Apple rates it at 50 meters under ISO 22810:2010. Apple Watch SE 3 from $249 is swimproof to the same 50 meters but has neither of those sensors, and Apple Watch Ultra 4 from $799 is the only model Apple describes...