Uses bioelectrical impedence to calculate variables. Basically, a small electric charge is passed through your body and the rate at which it travels gives you a measurement of the adiposity of your body. This measurement is highly dependant on hydration. That being said, I love my scale. The measurements are precise, meaning that from day to day they tend to be fairly stable (I always measure first thing in the morning after emptying my bladder). Though the precision in my experience is decent, the accuracy is a little off. I would guess that it is probably off by 3-5% from what the actual number is. In my case, I don't care about the actual percentage, just with what my fat is doing over time. One thing to note, if you are doing things that are going to significantly change body water content (i.e. using prohormones or steroids) then you may see some wacky numbers.
Calipers are more accurate, if used properly, than BI. BI is convenient and fairly precise but generally does not give accurate numbers. Underwater weighing is better than all of them but I doubt anyone is going to go through that on a regular basis. I've been tracking my weight daily (with the occasional miss here and there) for about 5 years now and the BI scale I have serves my purposes.
That is what i use it for and it works well enough.
That is surprising given how low it is. But now that you have benchmarked it, you have a general idea of its relative accuracy.
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