The InBody Analyzer uses safe, low-level electrical currents that run through hand and foot electrodes to measure body composition which gives us a lot more information that just measuring your weight, or even measuring your BMI using your height, weight and age. The more information you have, the better. The simple difference between weight and body composition is that weight is a measure of muscle, fat, and bones in the body, but body composition gives you the percentage of each which gives us much more information.