SAN FRANCISCO — A team from Lieff Cabraser Heimann & Bernstein is aiming for the jugular in a new suit against Fitbit Inc., claiming the company’s wearable heart rate monitors don’t work as advertised.

Fitbit’s Charge HR and Surge devices, which boast technology that monitors users’ heart rates during exercise, consistently report “wildly inaccurate” readings, according to a class action complaint filed Tuesday in the Northern District of California. Fitbit promoted the new “PurePulse” technology with slogans such as “every beat counts” and “know your heart,” and pictures of athletes using the devices during workouts.

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