"oximeter : (chemistry) A device that measures the quantity of oxygen in something, particularly air..."

“oximeter : (chemistry) A device that measures the quantity of oxygen in something, particularly air in the atmosphere.
(medicine, specifically) A device that measures the oxygen saturation of arterial blood.
Today is International Universal Health Coverage Day, which is recognized by the United Nations to emphasize that everybody should have access to good quality, affordable health care.”

- https://en.wiktionary.org/wiki/oximeter#English

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