Samsung says it has figured out a blood pressure monitoring application for a smartwatch, and the solution will start shipping on the Galaxy Watch Active2, a Tizen watch that launched last year.
https://arstechnica.com/gadgets/2020/04/samsungs-galaxy-watch-active2-can-monitor-your-blood-pressure/
https://arstechnica.com/gadgets/2020/04/samsungs-galaxy-watch-active2-can-monitor-your-blood-pressure/