Meet the Perfect Fitness Scale Pro: a smart weight scale that tracks your weight and measures your body fat percentage. It connects to your phone via Bluetooth and lets you track your progress and trends. It relies on Bioelectrical Impedance Analysis (BIA) to estimate your body fat percentage by sending a harmless amount of electricity into the body. The Perfect App lets you further analyze your weight data. The scale works for up to 4 unique users and stores data for up to 30 days for each user. Sets you back under $94.