How a small device called a pulse oximeter measures blood oxygen levels

A pulse oximeter is a device that clips on your finger, toe, or earlobe to measure blood oxygen saturation. Here's how it works and how to read it.
Sacramento Bee

What is a pulse oximeter? Should you use the device during the coronavirus pandemic?

Respiratory problems are one of the most common symptoms for the coronavirus. Some people have wondered if using a pulse oximeter to monitor oxygen levels could help detect COVID-19 early on. The ...