The AD8232 ECG module which is shown in the following picture is a single lead ECG device with 3 electrodes: But for cardiologists 3 lead ECG devices are gold standard for HR measurement as mentioned in this paper: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6732081/ An example for a 3 lead ECG device is the iWorx TA 220 In the following …
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