how can special body scales detect what you are made of, like body fat?

Question

I have some physical understanding, but how can they tell my body fat % and how accurate os that?

In: Technology

Answer 1

I had developed computer software for Tanita scales. They work by giving different doses of electricity through metal pads and reading the impedance values. Many models include hand parts so upper part is also measured. Then they correlate that data to their internal data set and produce the result. The only accurate way to read how much fat you have is to remove all the fat from your body anfter you die and then weight it. Close enough version includes submerging in special water pods.