Apple Watch Ultra really should not be used for diving underneath 40 meters. Drinking water resistance is just not a long lasting ailment and can diminish with time. For additional info see guidance.apple.com/HT205000. Where the Oura Ring Gen three experienced three protruding ridges within that housed the Exercise-monitoring sensors, https://aura-ring-size94825.eedblog.com/32339611/gold-aura-ring-things-to-know-before-you-buy