Traditional bio-impedance machines - such as scales you can buy for your home - use only one electrical frequency and two contact points (the feet) to estimate body fat. Therefore, they must rely on age-, gender-, and activity-based equations to guesstimate the percentage of body fat. Moreover, they can ONLY estimate body fat and total lean (non-fat) mass - which provides limited information, to say the least.
InBody utilizes EIGHT separate contact points and two electrical frequencies. With this technology, we can get DIRECT accurate measurements of body fat, lean muscle, intra- and extra-cellular water - with no "allowances" or fudging for age, gender, or activity level. Not only does the InBody track your body fat, hydration status, and lean muscle - it does so in 5 SEPARATE BODY SEGMENTS! The InBody analyzes each arm and leg, as well as the trunk, separately - to determine the precise body composition of each body segment.