You need to go by one scale.. they are all calibrated differently.. i know when i weigh myself at work (i work at a hospital and weigh daily) .. i do not not compare that weight to what i weigh in my surgeon's office ... the only thing that is accurate is the # of lbs lost ... so if you weighed 311 at home and then next time you weigh yourself at home, you weigh 300, then you know you have lost 11 lbs .. but the actual total weight you know will be off a bit ..

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