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CMS50N OLED Fingertip Pulse Oximeter Blood Oxygen Meter PR HR Heart Rate Monitor SpO2 Saturation Sensor - AliExpress
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Medicinalis - Finger Pulse Oximeter - SpO2 Pulse Monitor - Measures Pulse and Oxygen Saturation on Finger - OLED Display - Battery Indicator - Alarm - One-Touch Operation : Amazon.de: Health & Personal Care
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