Technology has improved a lot. There have also been improvements with medicine and also medical supplies and gadgets. One such gadget is the pulse oximeter. It measures the oxygen saturation of a person’s blood. In hospitals, it is often connected to a medical monitor to monitor a patient’s oxygenation. Oxygen saturation used to be measured only through blood samples. For those who need to monitor oxygen levels when exercising, mountain climbing, or for medial purposes, finger oximeters can be used.