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Fingertip Pulse Oximeter- HOLFENRY Pulse Oximeter Bluetooth Oximeter Oxygen Saturation Monitor for SpO2/Heart Rate/PI, with Auto Graph Display/Alarm/Dedicated App, Compatible with iOS&Android Black
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What is Perfusion Index (PI)?
What does the PI% actually mean in the oximeter? What is the range of a normal PI%? - Quora
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