is a senior reporter and author of the Optimizer newsletter. She has more than 13 years of experience reporting on wearables, health tech, and more. Before coming to The Verge, she worked for Gizmodo ...

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 ...

Share on Pinterest A pulse oximetry test may clip to a finger to read blood flow. Every system and organ in the body needs oxygen to survive. Without oxygen, cells begin to malfunction and eventually ...