We’re always looking for interesting biohacks here on Hackaday, and this new research article describing a calibrated pulse oximeter for different skin tones really caught our attention.

The Galaxy Watches, including the Watch 4, use a PPG sensor. The technology is very efficient at measuring your heart rate ...

Pulse oximeter types The most common of these devices is one that's placed over a patient's fingertip, though there are also version that can either be worn around your wrist or held in your hand.