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 that may be further processed into other measurements, meditsiinimõõtevahend, mis võimaldab mõõta kaudselt patsiendi vere hapnikuküllastatust (erinevalt hapniku küllastumise mõõtmisest otse vereproovi kaudu) ja naha veremahu muutusi, tekitades fotoverepildi, mida saab edasi töödelda muudeks mõõtmisteks, photoelectric device that measures oxygen saturation of the blood by recording the amount of light transmitted or reflected by deoxygenated versus oxygenated hemoglobin