@Artic Fox Re: How to get in on these scams
Do not forget to give it a fancy new name like "photoplethysmography "
This term and devices have existed long before fitbit was a wet dream or even a concept.
These devices have been around for years. ( Decades even. Source goes back to the 1960's.)
Ever notice the little device that the ER team / Surgery team slip on your index finger and it has wires up until the monitor that shows EKG, and HR and O2 levels. (If they put a cuff on you, it can also take and display BP.)