A pulse oximeter is a small device that helps you measure the levels of oxygen saturation in the blood. This portable device can be clipped onto a finger, toe, or earlobe. Pulse oximeters are especially helpful for those with respiratory problems such as lung cancer, asthma, heart issues, and many other health concerns. It can also be useful if you're feeling sick to determine whether or not your oxygen saturation levels warrant a visit to the hospital or emergency room
