Finger pulse oximeters allow people to read oxygen levels in the blood. Learn how to choose a finger pulse oximeter and what some of the best options are here.

The pulse oximeter has become a common device in hospitals and health care settings to painlessly reveal blood oxygen levels.

A pulse oximeter measures blood oxygen levels and is one of the key ways to determine how serious someone's case of COVID-19 is. But it's not always a racially equitable device.