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[Phys-L] digital balance on the fritz



I have a VWF Sargent-Welch digital balance that has recently taken to reading exactly (to within 1%) double what it should (tested with calibrated masses). Does anyone know how they work that would allow this to happen. Broken I can understand, but then it just shouldn't work at all. Broken in such a way as to read double what it should I don't understand.

Thanks,
Larry