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watchOS 5.1.2 for Apple Watch now available with ECG app, new Infograph complications, more - 9to5Mac
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Electrocardiogram Functionality in New Apple Watch Series 4 Models Limited to US, Coming Later This Year - MacRumors
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Apple Watch Series 8 (GPS) 41mm Aluminum Case with Starlight Sport Band M/L Starlight MNUF3LL/A - Best Buy
Apple Introduces the 'Game Changing' Apple Watch Series 4 that Delivers a Powerful FDA Approved ECG - Patently Apple
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