Pulse Oximeter Fingertip Blood Oxygen SpO2 Monitor PR PI heart rate w/ FDA 510K | eBay
Portable Fingertip Pulse Oximeter - Visionflex
Fingertip Pulse Oximeter with Plethysmograph and Perfusion Index, Include Carrying case, Large OLED Digital Display Blood Oxygen Saturation Monitor Heart Rate Monitor (Color: Red-Orange)