1. Polar OH1 can be used instead of an ECG device for some applications: https://journals.plos.org/plosone/article?id=10.1371/journal.pone.0217288 Polar SDK Polar Sensor Logger App HeartPy – Python Heart Rate Analysis 2. Polar H7/10 can be used instead of an ECG device for some applications: – Polar H10 is used as a reference device in this paper: https://hal.archives-ouvertes.fr/hal-03187457/file/OH1.pdf “Overall, …