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![A portable pulse oximeter - (a) Screen showing a reading of heart rate,... | Download Scientific Diagram A portable pulse oximeter - (a) Screen showing a reading of heart rate,... | Download Scientific Diagram](https://www.researchgate.net/publication/360476010/figure/fig1/AS:1156958660902912@1652851848241/A-portable-pulse-oximeter-a-Screen-showing-a-reading-of-heart-rate-oxygen.png)