What is the best blood pressure tracker watch for use in water sports?
What is the best waterproof iwatch for surfing in the day, and tracking blood pressure, pulse and sleep, at night?
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The best Apple Watch for water sports and only one I would consider for true water sports would be the Apple Watch Ultra. There is however, NO Apple Watch which tracks blood pressure in the water on land or anywhere else. Tracking blood pressure requires a cuff, which constricts your arm to measure pressure and continues to measure as the cuff pressure is reduced. Apple Watch cannot do that at all. And I'm not really aware of any wearable watch, which can accurately track blood pressure.
Also note that while Apple Watch Ultra is the most durable and purpose-built Apple Watch for sports, it is NOT waterproof. No Apple Watch is waterproof. And if you wear it in extreme water sports and it is damaged by water, it will not be covered by warranty. I love my Apple Watch Ultra, but personally would not wear it doing something like surfing.