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Amazon.com: Qardio Bluetooth Pulse Oximeter and Smart SpO2 Blood Oxygen Sensor. Track Results Over Time with the Free Smartphone App for iOS and Android. : Health & Household
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Amazon.com: iHealth AIR Rechargeable Fingertip Pulse Oximeter, Blood Oxygen Saturation Monitor with App, SpO2, Pulse Rate, Plethysmograph, and Perfusion Index : Health & Household
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Lawsuit alleges Apple Watch's blood oxygen sensor 'racially biased'; accuracy problems reported industry-wide - ABC News
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