The scale measures body fat by measuring electrical resistance. This isn't electricity you can feel--it's the same kind of device as the hand held ones.
If you weigh right after a shower, the dampness of your skin will change the electrical resistance and give a different reading. Better to weigh always under the same conditions, e.g., first thing in the morning, before a shower, after peeing, before eating or drinking anything. That's the only way to get a consistent reading from one measurement to the next.
If your scale also tells you water percent, you'll notice that that varies, too. Usually fat percent is lower when water percent is higher.
Watch the trends over time, not the differences from one day to the next.
Jay
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