Hi Cat,
I have 2 answers for you:
1. buy a new home scale that is less temperamental! I'm of the 'weigh only in the morning, before eating, after using the bathroom and while nekkid' school of weighing, and for that, you need a consistent home scale.
2. Just pick one! It sounds as though the scale at the gym is more consistent and consistent readings, really, are more important than accuracy. It doesn't matter if it's one or two or even five pounds off, as long as it is always one or two or five pounds off.
For years I had an ancient scale that was somewhere between 5 and 10 pounds wrong. It didn't matter at all. If I lost weight, the scale would tell me; if I gained weight, ditto. I only got a new one because I wanted a digital scale that would measure in proper increments. The 'absolute' true number of your weight is less important than tracking your losses and holding steady during maintenance.
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