This is a great product. My father has heart arrhythmia and atrial fibrillation and this is incredibly useful to make sure he is properly oxygenated. Its accuracy seems excellent, since the rest of the family all get 99%-100% while he gets 92%-97%. The heart rate monitor reflects readings from his Apple Watch. This is quick and easy to use and brings peace of mind. And the blue color makes it easy to find (maybe the carrying case should be blue, too!). An excellent home medical instrument.
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