I have a Soehlne "Atlantic" scale. The set up requires my height, sex and age. It has settings for 4 people. It measures weight, % body fat, and % water. That way you know if your body fat number is low due to excessive water or if you body fat number is high because you are dehydrated. A moderately hydrated reading is the most accurate. It is very consistant.

As to accuracy, I had a 4-wire measurement taken at a clinic and it showed a reading 6% lower than my home scale, BUT I ingested a lot of water beforehand. I general terms, I figure tracking body fat at home is a measure of change - up or down.

Additionally, one must remember that for the lean body fat percentages of athletes, there are different parameters and different scales.

Remember, when using an electronic impulse body fat scale, one must have arms and legs not touching and slightly bent knees. AND make sure the scale and your feet are dry.