When the Polar OH1 came out, we were very happy about a PLOS ONE paper, which found out, that the Polar OH1 can be used instead of an ECG device, as far as accuracy is concerned: https://journals.plos.org/plosone/article?id=10.1371/journal.pone.0217288 We expected a further development as far as the accuracy is concerned in the Polar OH1 successor Verity …
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