The UM-051 has the ability to measure your total body water percentage, body fat percentage and total weight. You can now keep track of how well hydrated you are, percentage of fat in your body as well as your overall weight all through the one scale. These amazing bathroom scales feature 4 electrodes and advanced dual frequency Bioelectrical Impedance Analysis (BIA), which sends a safe electrical pulse through your body and measures your body fat in increments of 0.1% for ultimate precision.