Consistency in an individual’s level of hydration and blood circulation is needed for accurate assessment. I haven't found a lot of research on the InBody, but what I have suggested that it tends to underestimate body fat by a several points. It is ONLY accurate if you truthfully enter your height, weight, age, gender and activity level. Athletes typically have much less body fat. Measures body fat, heart rate, body water weight, lean muscle mass, and your overall weight. OF COURSE, it only calculated BMI based on the inputted height and weight. Accuracy: Limited information is available, but some 3-D scanners may be fairly accurate with errors of around 4% body fat . According to some experts, a “healthy” range is 23 to 33 percent for middle-aged women, 11 to 21 percent for middle-age men and up to 35 percent for older women and 24 percent for older men. "The scales underestimate or overestimate body fat percentage by quite a lot. Body Fat Scanner Accuracy. The key to getting the most accuracy out of any BIA device is to perform the test under standard conditions: 1. Scales measuring or estimating body fat percentage use a process called Bioelectrical Impedance or BIA. It is perfect for families. Hands down the best body fat scale for accuracy and consistency. 2. Yes, changing height and weight will change the body fat % too, but that is invalid. You MUST also hold it correctly. One of the most frequently used body fat analyzers is a device that measures body composition through bioelectrical impedance analysis or BIA. BIA is a safe, quick and fairly accurate estimate of body fat percentage, but it must be performed under consistent conditions. It is more commonly known as the body fat analyzer or body fat machine. ... By using a full-body composition analyzer as provided in the Omron HBF-514C Full Body Composition Sensing Monitor, you can monitor your body fat levels, including visceral fat, to ensure that you’re losing the unnecessary fat rather than the important muscle mass of your body. It is an FDA listed smart scale brand that is being used by over 5,000,000 users. The hand-held body fat analyzer sends an electrical current through the body and measures the amount of resistance to the current. Instructional video: Here is a video showing how a 3-D body scanner works. Those are the ONLY factors allowed to be considered. No food or caffeine within 2-4 hrs of the test. Ideally, you would want to do it fasted. Con: Some Amazon reviewers pointed out that the body fat accuracy is a bit off. Can sync with Apple Health, Google Fit and Fitbit; Cons: The Withings body analyzer uses a scientific technique that is widely recognized as the best method for at-home body mass measurement. "The body fat scales you can buy online are safe and convenient, but they aren't accurate," says Dr. Woolcott, who adds that studies on these devices aren't reliable because they're tested on a small number of people. Rating a body-fat scale on its ability to gauge body fat was more complicated, and the results were unimpressive: None was very accurate.