![Amazon.com : POLAR H7 Bluetooth Heart Rate Sensor & Fitness Tracker (Black, Medium/XX-Large) : Heart Rate Monitors : Sports & Outdoors Amazon.com : POLAR H7 Bluetooth Heart Rate Sensor & Fitness Tracker (Black, Medium/XX-Large) : Heart Rate Monitors : Sports & Outdoors](https://images-na.ssl-images-amazon.com/images/I/41eUxIiVtbL._AC_UL210_SR210,210_.jpg)
Amazon.com : POLAR H7 Bluetooth Heart Rate Sensor & Fitness Tracker (Black, Medium/XX-Large) : Heart Rate Monitors : Sports & Outdoors
![Amazon.com : POLAR H7 Bluetooth Heart Rate Sensor & Fitness Tracker (Black, Medium/XX-Large) : Heart Rate Monitors : Sports & Outdoors Amazon.com : POLAR H7 Bluetooth Heart Rate Sensor & Fitness Tracker (Black, Medium/XX-Large) : Heart Rate Monitors : Sports & Outdoors](https://m.media-amazon.com/images/I/61WDvqUucnL._AC_UF350,350_QL80_.jpg)
Amazon.com : POLAR H7 Bluetooth Heart Rate Sensor & Fitness Tracker (Black, Medium/XX-Large) : Heart Rate Monitors : Sports & Outdoors
![Polar H10 drop during training. This is started from June. I have reset the H10 sensor but it is still dropping during the workout (crossfit). I have 2 possible scenarios.1) the o-ring Polar H10 drop during training. This is started from June. I have reset the H10 sensor but it is still dropping during the workout (crossfit). I have 2 possible scenarios.1) the o-ring](https://preview.redd.it/ch8apbsptm971.jpg?width=1440&format=pjpg&auto=webp&s=bca5ad6d0b8b4f07d4fcf9d4fc844f39fddf42f9)