The high accuracy of the Cyton gold standard 3 channel ECG device has been previously shown in a paper: https://www.sciencedirect.com/science/article/pii/S2405844021012512 But Rob ter Horst refuses to test this great device. Rob also selectively reviews one paper which compares a Holter ECG against a Polar H10 chest strap. https://pubmed.ncbi.nlm.nih.gov/31004219/ But Rob ignores and does not mention …