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 ...

Nonin Medical's LifeSense® multi-parameter monitor provides numeric EtCO2 and SpO2 values in addition to a continuous visual waveform — making it ideal for spot checks or continuous monitoring.