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Hi Kelly
Wow, that much variance from day to day... I think you need a new scale. I can see where it would vary a point of a percentage, like from 39.0% +/- 0.5% but not the kind of swings you see.
Oh! are you barefooted? you have to be barefooted, there has to be bare skin contact with the plates.
Okay, as for how they work, your body is mostly water. Water holds an electrical charge really well, which is why you never take a bath with a radio. DEATH! So, what happens is these scales have a small electrical current that runs through your body. Depending on what your body composition is, you have so much muscle, water/blood/fluid, bone and fat. Each of these diffferent parts of you has a different way the electrical current runs through.
The scales that have the body fat percentage checker work better for men because women generally have more fat in our legs than men do, so it gets sort of hung up with the fat there. A better place to measure our true body fat percentage is in our hands or arms. Bell brand makes a nice hand held model, as do ither companies. (this is not an endorcement per se for Bell, it's just the brand I have). :D
Also, your hydration level matters for your body fat%.
any other questions?
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