Pulse rate, blood pressure and blood sugar levels are some of the few things that almost every physician would want to know if the health of a middle- ...

The theory behind a pulse oximeter relies on the fact that hemoglobin absorbs red and infrared light differently based on its oxygenation levels.

A pulse oximeter is simple to use. Slip it on your finger, wait a few seconds, and you'll get a readout of your blood oxygen level and your pulse rate.