Tirzah is right--only weigh yourself on one scale. Otherwise, you will go insane because all scales have their own minor fluctuations. My scale at home is always about 2 pounds higher than the scale at my TOPS meeting, and the scale I used to use at the gym was almost 10 pounds higher than my home scale, and my doc's scale fell somewhere in between. It's really not very strange at all--just pick one scale and stick to it consistently.
Oh, and hard surfaces are always best. A scale on a plush carpet will likely give you an inaccurate reading.
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