Practiced infrastructure Soviet make your own pulse oximeter industry Promote the study
What's a pulse oximeter and how can it tell if I have Covid-19? | Coronavirus | The Guardian
Amazon.com: Easy@Home Fingertip Pulse Oximeter (Not for Medical Use) - SpO2 Blood Oxygen Saturation Meter and Heart Rate Monitor -EHP050 : Health & Household
Oximeter do it yourself | Hackaday.io
DIY Pulse Oximeter you can make 5.Assembling Probe - YouTube