Signal Ring Aims for Cuffless, Calibration-Free Blood Pressure Readings
TL;DR Summary
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.
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