A new study reveals that Fitbit‘s (NYSE:FIT) heart monitors may be inaccurate.
California State Polytechnic University researchers studied the devices’ trackers and found that they are prone to inaccuracies with its PurePulse monitors.
In high intensity workouts, the Fitbit monitors were off by as many as 20 beats per minute. However, the company claims that the study is “baseless” and “biased.”
Fitbit added that the move is nothing more than an attempt to squeeze some cash out of the company as a law firm has already filed a class action lawsuit against it.
FIT stock is down 4% Tuesday.