A battery-powered instrument designed to continuously measure the concentration of oxygen (O2) inspired by a patient in a respiratory maintenance/therapy setting (e.g., O2 in an anaesthesia or ventilator breathing circuit, oxygen tent, oxygen therapy device/system tubing). It typically consists of an electronic unit with a display to show actual values of percentage of O2 concentration, a sensor to detect the O2 values, control knobs or buttons, and an alarm to alert when O2 values are beyond a predetermined range.
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