SparkFun Pulse Oximeter and Heart Rate Sensor - MAX30101 & MAX32664 (Qwiic) | The Pi Hut
Pulse Oximeter Fingertip,4 In 1 Oximeter Perfusion Index,Respiratory Rate,Heart Rate Monitor,Oximeter Blood Oxygen Saturation Monitor,With OLED Screen and Alarm Function : Amazon.co.uk: Health & Personal Care
Fingertip Blood Oxygen Monitor and Heart Rate Monitor | DIY at B&Q