Let me tell you a little about BF scales. Like folks said, they are NOT a good indication of what your actual BF is. There are too many factors involved for it to be consistent and accurate, including your sex, BF, muscularity, hydration, time of day, last time you exercised, etc (and those are all real factors that are easy for anyone to verify.
BUT . . . what a BF scale is VERY good for is comparison. Measure your BF on the scale at the same time every day, and try to make it under the same circumstances (ex hydration level). For me what works best is measure just after I wake up in the morning, and I do this routine. This is a good way to measure progress or digression in your BF goals. Very effective, easy, and motivating. The more measurements you have, the more accurate the comparison will be.
I find the BF scale indispensable, but to get a real, no BS measurement, you need the "dunk tank" or DEXA. The dunk tank measures via water displacement, etc, and is extremely accurate. About $40 there. DEXA is equally accurate, but it is only done in a medical office (that I've seen), and it can run $100-150. DEXA is definitely an FSA item and you might have some success getting medical insurance to pay for it, reducing the cost.
DEXA is available all the time, while find a consistent location for the dunk tank has been hit and miss for me, as they seem to be mainly mobile.
I would highly recommend getting dunked or DEXAed, and then compare that ASAP to a reading on your BF scale. Doesn't make the BF scale any more accurate, but you'll have an idea of the correction that needs to be applied.
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