The pulse oximeter feature no longer found on newly purchased Apple Watch Series 9 and Apple Watch Ultra 2 models
Cook firmly believes that there are other reasons besides the pulse oximeter to buy a new Apple Watch and instead of giving in to Masimo, this could result in Apple working even harder to develop the Holy Grail of smartwatch health sensors, a non-invasive blood glucose monitor. Both Apple and Samsung are working hard on such a tool that eventually would allow insulin-dependent diabetics to get a reading on their blood sugar without a painful and expensive test that involves drawing a drop of blood and placing it on a disposable test strip three or more times each day.