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Amazon.com : Polar H9 Heart Rate Sensor – ANT + / Bluetooth - Waterproof HR Monitor with Soft Chest Strap for Gym, Cycling, Running, Outdoor Sports : Sports & Outdoors
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Amazon.com : Polar H10 Heart Rate Monitor Chest Strap - ANT + Bluetooth, Waterproof HR Sensor for Men and Women (NEW) : Sports & Outdoors
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Heart Rate Educational Starter Pack with Polar Wireless Sensors : ID 1077 : $65.00 : Adafruit Industries, Unique & fun DIY electronics and kits
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