Scales all read different, even the expensive medical beam scales will read from 1-8 Lbs different. Normally I don't even bother with them, but I am using a scale right now, but only because I am getting ready for a show. I only use 1 scale, and I use it 1-2 times per week. Otherwise I use the mirror, a set of calipers and a measuring tape to cheart my progress. Later