Body fat scale is a weighing instrument that can measure fat, moisture and so on besides weight. There are two kinds of sensors for measuring body fat in the market: ito film and electrode sheet.
The principle of human body fat scale is that muscle contains more water such as blood and can conduct electricity, while fat is not.
Because the channel conductor of current in the body is muscle, the weight of muscle can be known from the difficulty of current passing, so the proportion in the body can be judged.