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เซ็นเซอร์สายคาดวัดชีพจร Polar H1/H7 ไม่ทำงาน เปลี่ยนถ่านแล้วยังไม่หาย
How to get the battery out of this heart rate monitor? I can't even fit a paper between the battery and the case : r/howto
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Amazon.com: Heart Rate Monitor USA Replacement Soft Strap (Works with Polar H7 H9 H10 & More / Works with Garmin Dual) Med/XXL : Everything Else
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