Inaccurate fat analyzer

Does any one have experience with a hand held fat analyzer? I bought one at Radio Shack and it seems very inaccurate. The directions say to check at the same time of the day, fully hydrated, etc. If I follow the directions it says that I am slight overweight (I'm 5'5" and about 120, bmi of on the low side of normal). I talked to a sales person and they said to do it upon getting up, after going to the bathroom, before drinking anything. It seems a little more consistent that way, but still says that I am slightly over weight (25-27% body fat). It also says that my son who is 5'9" and 115 lbs is normal!! Has any postie had experience with this? Are they not accurate for any one or just not for post ops?

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