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There's a few ways, which are somewhat accurate, but it takes someone who really knows what they're doing, otherwise it's +-10%. In one method they see how wide skin folds are compared to height, weight, age, sex, etcetera and look it up in a table. Another involves a scale with electric pulses. The third, and most fun, is water displacement. How much you weigh on land, vs. how much you weigh in water (fat floats). The most accurate of those should probably be water displacement, but it's the hardest to do, due to air in lungs, blood volume, etc.
If you want it just once out of curiosity, go to sharper image, or bed bath and beyond, both of which have the scales, and try it out.
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