Going beyond simply measuring your weight when you stand on them, the digital scales can also measure and log your overall health, fitness and weight loss goals using connective technology to keep you on track. The best smart scales, also known as body composition scales or body analyzer scales, can track not only your weight but your body fat, BMI and muscle mass, with some models even recording your bone mass and heart rate, synching the data collected to build up an overall picture of your progress.\r