You know what it looks like… but what is it called?
TAKE THE QUIZpulse oximeter
noun
plural pulse oximeters
: a noninvasive medical device that utilizes spectrophotometry to measure the oxygen saturation of circulating arterial blood in an individual by determining the percentage of oxygenated hemoglobin pulsating through a network of blood capillaries by way of a sensor attached typically to a finger, toe, or earlobe
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Merriam-Webster unabridged
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