OMRON's Fat Loss Monitor with Scale estimates the body fat percentage by using the Bioelectrical Impedance (BI) Method. Muscles, blood vessels and bones are body tissues having a high water content that conducts electricity easily. Body fat is tissue that has little electrical conductivity. The Fat Loss Monitor with Scale sends an extremely weak electrical current of 50 kHz and less and 500 µA through your body to determine the amount of fat tissue. This weak electrical current is not felt while operating the Fat Loss Monitor with Scale.