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Snuffy was referring to the other axis of the scale, for balance beams. Your "standard" axis is the Z axis, for zeroing the scale. However, if it is also out of level in the X axis, it causes drag on parts of the scale that should not be touching.
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Thanks Frank, there ARE two axis to being level. Why not have both level, then you know for sure there's no off center force on the beam, or plenum of a digital.
Take a level to whatever base your scale sits on, first along the length of the scale, then at 90 degrees to that. Both should be in the center of the glass.