Israel’s Yopi (Your Online Personal Instructor) Technologies has developed a wristband sweat analyzer that uses biosensors and AI to track an individual’s health in real time. It measures oxygen consumption (VO₂) to assess the condition of the arteries and is far more accurate than a heartbeat monitor.

https://www.timesofisrael.com/sweat-monitoring-startup-to-build-factory-for-wearable-that-tracks-oxygen-consumption/

https://www.yopitech.com/#/

https://www.youtube.com/watch?v=0TV1JBe_GYQ