This body composition scale earned The Best rating from the Hammacher Schlemmer Institute because it was the most accurate and automatically recognized programmed users. The University of Illinois Chicago's Human Performance Lab compared their hydrostatic body fat measurements of panelists to each body composition scale's readings, and The Best model was 93% accurate--far superior to lesser scales that were merely 73% accurate. Each model's weight readings were compared to those taken on a medical-grade beam scale, and The Best Body Composition Scale deviated by only .08%. The Best model uses a harmless electrical impulse (Bioelectrical Impedance Analysis) to obtain readings, a method proven to be more accurate than the body mass index method used by typical scales. It measures and stores body fat percentage, weight, and muscle mass readings for up to eight users, displays dietary and exercise recommendations on the 4" LCD, and automatically shows each person's previous readings when they step on the scale. Measures body fat, muscle, and water to 0.1%; weight to 0.2 lbs. 330-lb. capacity. Includes four AA batteries. 14 1/2" L 13 1/2" W x 3/4" H. (4 1/2 lbs.)