BV Medical Fingertip Pulse Oximeter (50-104-004-L)
Amazon.com: 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 : Health & Household
What does PI% in an oximeter reading indicate? What is its significance? - Quora
What is Perfusion Index (PI)?
LPOW Bluetooth Pulse Oximeter Fingertip, OLED Display, Blood Oxygen Sa – Lpow