For cardiologists in the Cleveland Clinic in Ohio 3 lead ECG devices are gold standard for HR measurements: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6732081/ Instead of testing the accuracy of 100 smartwatches and no one confirms this data, why not to choose a 3 lead ECG device by ourselves which is not in doubt about its accuracy? The most affordable …
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