TECH NEWS
No sleep score, no steps: this Signal smart ring from an ex-Google head is focused on cracking cuffless, calibration-less blood pressure readings
Blood pressure has long been considered the "holy grail" of PPG-powered wearable tech. Because (up until now) you really need an inflatable cuff to measure, or at least to calibrate, blood pressure readings, and that's been difficult to do with a smartwatch alone. The Huawei Watch