One of the most important metrics on a Fitbit tracker is the Estimated Oxygen Variation – and now that every tracker is fitted with an SpO2 sensor, everyone can take advantage. Blood oxygen can be ...

Quality sleep is often cited as key to improved physical recovery, mental well-being, and better illness outcomes. So, using a dedicated bedtime tracker to check on your rest has a genuine purpose.

A pulse oximeter measures your blood oxygen levels and pulse. A low level of oxygen saturation may occur if you have certain health conditions. Your skin tone may also affect your reading. Pulse ...