In the paper, the signal quality of a Polar H10 chest strap was determined and compared to a Schiller Medilog AR12 Plus Holter ECG Recorder for $1700: https://pubmed.ncbi.nlm.nih.gov/31004219/ The signal quality was determined by analysing individual ECG peaks manually. But there are for instance from iWorx toolboxes available to study every single ECG peak in …