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BT Version Household OLED Display Finger Oximeter Pulse Rate Perfusion Index SPO2 Blood-oxygen Data 4in1 Measurement Device - Newegg.com
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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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Biosensors | Free Full-Text | Reflection-Boosted Wearable Ring-Type Pulse Oximeters for SpO2 Measurement with High Sensitivity and Low Power Consumption
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