The BF-684W Body Fat and Body Water Monitor, uses Multi-Frequency Bioelectric Impedance Analysis (BIA) technology, a clinically validated FDA cleared method of determining body fat. BIA sends a low current through the body, it passes freely through the fluids contained in muscle tissue and in blood, but encounters difficulty when passing through fat tissue, which contains little water. By using the impedance reading along with gender, age, height and weight the scale can quickly and reliably calculate body fat and total body water. Tanita Body Fat Monitors provide vital in-depth information that allows you to accurately observe the impact of a diet and fitness program.

Monitoring body fat with the BF-684W, is an essential tool for precisely measuring your body's inner health. Maintaining healthy body fat levels has far more value than simply calculating your body mass index (BMI). Proper hydration is essential for life. Maintaining a healthy body water % improves overall health, keeps you feeling energized and operating at a peak performance. Average range for a healthy adult female is 45 - 60% and for a male 50% - 65%.