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SparkFun Pulse Oximeter and Heart Rate Sensor - MAX30101 & MAX32664 (Qwiic) | The Pi Hut
Fingertip Pulse Oximeter, Blood Oxygen Monitor Finger For Adults & Children, Heart Rate Monitor Fingertip and sp02 Oxygen Meter, with Large OLED Display Included Batteries and Lanyard : Amazon.co.uk: Health & Personal