Given that there's a lawsuit over the accuracy of Fitbit trackers' heart rate monitors, you might be wondering how trustworthy those wearables really are. Should you buy a chest strap if you need to track your BPM? Not necessarily, if you ask Consumer Reports. It just retested both the Charge HR and Surge under more stringent conditions (additional arm locations and higher-impact workouts), and it found that both were effectively as accurate as a chest-based heart rate monitor. The only significant deviation was when using the Charge HR in particularly intense workouts, and even that could be fixed by wearing the wristband on the forearm.