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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.
The Pulse Oximeter will also have a light sensor, calibrated to measure the two wavelengths of the lights in use for the measurement. When performing an oxygen saturation reading, both lights will be shined through the finger and the light sensor will read the amount of light that reached the sensor.