Signal Ring gives blood pressure readings, not just alerts like Apple Watch

Five Apple Watch models are able to measure your blood pressure in order to generate alerts for possible hypertension. However, they do not provide your actual blood pressure readings. A few smart rings and other fitness devices do so, but rely on regular calibration with a traditional cuff monitor. The upcoming Signal Ring says that it delivers full blood pressure measurements without any calibration, and that a trial of thousands of people backs the claim …