The most common method for measuring body fat is the air displacement volume scanning method. The body's fat conductivity is very poor and has high resistivity, while muscle, on the contrary, has good conductivity.
The correct measurement method is to take off shoes and socks, and then the low-voltage current of the body fat scale will pass through the human body. This method is more accurate than the air-dispensed method, which measures the volume of fat in the body.