For the year 2022, I invested in the Chinese version. In 2022, when used with an iPhone, it's fantastic. benefits from Integral pulse oximeter validated by medical devices. The accuracy is good, with a margin of error of only 1% to 2%. Against it: Resting-only oxygen sensor. While driving, oxygen levels are not shown. The iOS app does not permit the addition of new screens. Those that come standard are horrible.
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