Some Wearables Can Track Blood Pressure. Do They Work?

Blood pressure is notoriously tricky to measure, whether in a doctor’s office or at home. Now, several wearables—including the Oura Ring and the latest Apple Watch—say they can help people track their blood pressure without an inflatable cuff. WSJ personal tech columnist Nicole Nguyen explains how these devices held up to real-life testing. Danny Lewis hosts.

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