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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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Wellue Bluetooth Wireless Fingertip Pulse Oximeter. iOS & Android APP. SpO2 & Pulse Rate. FDA Approved.
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OLED Bluetooth Pulse Oximeter Fingertip Blood Oxygen Saturation Monitor, Heart Rate and Fast Spo2 Reading Oxygen Meter with with APP for Smart Tracking - Walmart.com
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Amazon.com: Rechargeable Oxygen Meter Finger Pulse Oximeter, SmileCare Bluetooth Pulse Oximeter Fingertip Blood Oxygen Saturation Monitor with Heart Rate and Perfusion Index with Free App iOS & Android for Adult : Health
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