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A pulse oximeter probe applied to a person's finger. A pulse oximeter is a medical device that indirectly monitors the oxygen saturation of a patient's blood (as opposed to measuring oxygen saturation directly through a blood sample) and changes in blood volume in the skin, producing a photoplethysmogram.ulse oximetry is a non-invasive method for monitoring a person's O 2 saturation.
How does a Pulse Oximeter work? A Pulse Oximeter works by shooting light through the area of our body being used for the measurement (lets, assume from now onward that it is a finger) and detecting the amount of light that managed to to through that finger.