Pulse Oximeter Yimi Life YM103 is a Blood Oxygen Saturation Monitor (SpO2) with Pulse Rate (PR) and Perfusion Index (PI).An oximeter is used for measuring the pulse oxygen saturation through the finger.Perfusion IndexThe normal perfusion index (PI) ranges from 0.02% to 20%. If the perfusion index is at or below 0.4% showing weak pulse strength, then the oximeter reading can…