electrical impedance and calipers have an error margin of +/- 8 %. That is way to high. Both these methods are really worthless then. Anyone ever try Bodpod or Hydrostatic weighing? Check out Bodpod.com for an area near you. i will try but right now I know I am fat so I dont need a machine telling me that. But bodpod can also give a metabolic analysis of how much calories you burn at rest. Check it out doughboys