Signal Ring Aims for Cuffless, Calibration-Free Blood Pressure Readings
Vital Signals' Signal Ring promises cuffless, calibration-free blood pressure tracking from a fingertip sensor, supported by a 451-person clinical study; preorders are $399 with shipments expected in October, but experts caution that PPG-based measurements can be affected by motion, skin tone, and circulation, and the device is not FDA-cleared yet.