Taking an EKG is easy with KardiaMobile 6L from AliveCor.
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Frontiers Six-lead electrocardiography compared to single-lead electrocardiography and photoplethysmography of a wrist-worn device for atrial fibrillation detection controlled by premature atrial or ventricular contractions: six is smarter than one
The KardiaMobile 6L reads your heart-rate with 6 times the accuracy of an Apple Watch - Yanko Design
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Frontiers Six-lead electrocardiography compared to single-lead electrocardiography and photoplethysmography of a wrist-worn device for atrial fibrillation detection controlled by premature atrial or ventricular contractions: six is smarter than one
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Apple Watch Series 6 review: More health data, but less to do with it