How good is the Fitbit Charge 2 heart rate monitor?

I’ve been playing with the Fitbit Charge 2 for the last couple of weeks. As I was reminded when I posted on Reddit about the experience, there’s a lawsuit against Fitbit that claims its heart rate monitor is egregiously inaccurate. But from what I’m seeing, the tracker output squares up well …

Fitbit Charge charts a wild heart and calm mind

A few days ago I bought a Fitbit Charge. A colleague had praised its heart rate monitor’s accuracy and I wondered about my own heart rate when running up hills. According to the Charge, my heart rate goes up and down more than I’d previously realized. A lot more. I’d always pictured …