Pulse oximeter provides an easy way of partly assessing someone's breathing by measuring the oxygen saturation of arterial blood. Pulse oximeter determines the presence of the percentage of hemoglobin that is saturated with oxygen. The pulse oximeter measures blood oxygenation by sensing the infrared and red light absorption properties of deoxygenated and oxygenated hemoglobin. Pulse oximeter is comprised of a sensing probe attached to a patient's earlobe, toe, or finger, which is connected to a data acquisition system for calculation and display of oxygen level, heart rate, and blood flow.