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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Smartphone's camera, flash can measure blood oxygen up to 70% at home, ET HealthWorld
Electronics | Free Full-Text | Development of a Low-Cost Pulse Oximeter for Taking Medical-Scientific Parameters to Monitor Remote Patients
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PMT Fingertip Pulse Oximeter
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Smart Fingertip Bluetooth Pulse Oximeter
