Issue 1 Rob ter Horst is a scientist who tested 100 smartwatches: His scientific reference device is the Polar H10 chest strap: And his scientific justification to choose the Polar H10 chest strap is this paper: https://pubmed.ncbi.nlm.nih.gov/31004219/ But in this paper of the Cleveland Clinic in Ohio: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6732081/ The cardiologists used a 3 channel medical … Continue reading 090b. Rob ter Horst: issues of the scientific justification to choose the Polar H10 as a reference device for his tests