Apple Watch 6’s blood oxygen sensor is unreliable and misleading

An Apple oxygen check a day will not keep the doctor away, at least not yet. The way consumer tech companies are marketing health capabilities is getting ahead of what their gadgets can actually, reliably do. That’s a dangerous trend, and it jeopardizes the potential positive effect that collecting body data could have on our health.

And it’s particularly deceptive at a time when many people are looking to health monitors for any clue that they may have covid-19, the illness caused by the novel coronavirus.

For the past week, I’ve been wearing a smartwatch on each wrist, all day and all night long. On the right I have the Apple Watch Series 6, and on the left I wear the new $330 Fitbit Sense, which went on sale this week.

There are many reasons that people buy wearable gadgets. I wear an Apple Watch for fitness motivation and to

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