Bioelectrical Impedance is another method of assessing body fat percentage. There are a variety of body composition and body fat analyzers and scales that provide more than just total weight measurements. These devices determine the percent and amount of body fat, muscle mass, water, and even bone mass by sending an electrical impulse through the body (you won't feel a thing) and measuring the body fat by how easily the impulse is transmitted. These devices are good at giving you a sense of how your body fat may change over time but may not be highly accurate.

While the readings can be affected by hydration levels, food intake, skin temperature, and other factors, if you follow the directions and take the reading under similar conditions, you can obtain reasonable results.