Originally Posted by Phil_gretz

These are the two concepts barely understood in this thread and misunderstood by most who attempted to explain their measurements.

^ the immediately-above response has to do with precision, not accuracy. Precision is how small a variation the scale will measure, and (if digital) will round to. For a bathroom scale, precision will vary. Mine is +/- 0.5 lbs, which is too course for bike measurements.
.