Amazon.com: Easy@Home Fingertip Pulse Oximeter (Not for Medical Use) - SpO2 Blood Oxygen Saturation Meter and Heart Rate Monitor -EHP050 : Health & Household
PULSE PERFECT Oximeter
Can't find a pulse oximeter? Create your own! | Arduino Blog
Decoding pulse oximeters: Does it provide an accurate reading? Here's what you need to know - The Economic Times
DIY Pulse Oximeter you can make 5.Assembling Probe - YouTube