FitBit, a tech company that makes activity and health tracking devices, is under fire once again because of its rash-creating Force Fitness tracker, the newest wristband in its wearable line. This time, its in the form of a class-action lawsuit. FitBit voluntarily recalled the Force model in February after 1.7 percent of its users experienced skin irritation as a result of wearing the device. And the company has offered full refunds to its customers, including free return shipping, if they submit a claim on the FitBit website. …