Fitbit Charge HR review: a heart-rate tracker that's skipped a beat

Great for telling general activity, but this fitness tracker doesn’t provide any meaningful, useful data from measuring heart rate
San Francisco-based Fitbit has released seven fitness trackers since the company launched in 2007, but the Charge HR is the first to include a heart-rate monitor that claims to help users track their cardiovascular health.After the failure of its Force wristband – which was recalled after it caused rashes on users’ wrists – the company needs a home run to mai