Bioimpedance scales measure body composition by sending a single current through your entire body. When you step on the scale, the current will find the shortest and quickest path through your body, so it will flow through one leg and out the other. This current will mostly flow through your lean mass as this is most conductive, so none of the current will actually flow through your fat content. Your percentage of fat is then estimated, and highly dependent on variables such as level of hydration, bone density, etc.
Skulpt measures body fat percentage by measuring how current flows through tissue. It's different than biompedance scales in that our algorithms don't take into account your age, height, or weight. Our algorithm is strictly based on the electrical characteristics of tissue, recognizing that fat has very different characteristics than muscle. For most people, this yields a significantly more accurate result than bioimpedance scales.
When we conducted studies comparing our technology to hydrostatic weighing and DEXA (the gold standard) and bioimpedance scales, our results were about 5 times more accurate (the typical error was less than 1.5%, compared with the scale which showed errors of up to 5-10%).
Additionally, Skulpt also measures individual muscle groups, as well as your muscle quality (MQ). Something that bioimpedance scales, or any other device on the market, cannot give you.