The day Fitbit announced the Blaze tracker at CES, a class-action lawsuit harshed the company's buzz. (That, and an 18 percent drop in its stock price.) The claim was the heart rate monitor on the Fitbit Charge HR and Surge were inaccurate enough to cause harm. Fitbit pointed to its disclaimers, saying the monitor wasn't meant to be a medical device after all. Maybe Fitbit … [Read more...]