Review on COOSPO Bluetooth & ANT+ Heart Rate Monitor Armband - Optical HRM Sensor, Waterproof IP67, Fitness Tracker Armband Compatible with Zwift, Wahoo Fitness, Endomondo, Peloton - Includes One Extra Free Armband by Ryan Ramirez

I really wanted to like this. It's small, easy to use and connects easily to my PM-5. But once you start rowing, thoughts spread across the map. See attached photo of the last part of the morning workout: 20 minutes at a relatively constant 27 bpm. I started the phase at 108 bpm but as soon as I started pulling the paddle it dropped precipitously to 54 (I'm a slightly overweight 58 year old male, I'm not in that shape at all) and randomly fluctuated between 54 and 82 When I stopped rowing after 20 minutes, it immediately peaked at 120 — which I knew depended on how hard I was breathing. I've been trying for weeks to find a spot on my arm where it would work. no Can I get my money back?