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This app claims to let users monitor SpO2 levels and pulse rate with your smartphone: Here's how it works | Tech News
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Low-cost audio-based smartphone oximeter with integrated pre-amplifier... | Download Scientific Diagram
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Amazon.com: Wellue Pulse Oximeter Fingertip| Bluetooth Blood Oxygen Saturation (SpO2) & Heart Rate Monitor| O2 Meter 20F, Batteries and Lanyard Included : Health & Household
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Amazon.com: Mibest Bluetooth Pulse Oximeter - Blood Oxygen Saturation Monitor with App - SpO2, Pulse Rate, Respiration Rate, Plethysmograph and PI - Compatible with iOS & Android Smartphones - Free App : Health & Household
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