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Amazon.com : Polar T31 Coded Chest Transmitter and Elastic Strap - Black : Heart Rate Monitors : Sports & Outdoors
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User manual Polar WearLink + Coded Transmitter 31 (English - 11 pages)
Troubleshooting your heart rate monitor/strap HR spikes | DC Rainmaker
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Amazon.com : Polar T31 Coded Chest Transmitter and Elastic Strap - Black : Heart Rate Monitors : Sports & Outdoors
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Amazon.com: Polar T34 Transmitter HR Chest Strap by Kettler Fitness (Model 392027802) : Sports & Outdoors
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