As the digital scales go I was in the market for industrial scale almost exactly an year ago. At the first glance the stated accuracy is simply function of ADC resolution and maximal measurable weight. On the second glance it is mostly about market segmentation and certifications, because for all manufacturers I've considered getting order of magnitude better stated accuracy seems to be a matter of software license and different cal certificate (and the SW license seems to only affect the error term reported by the scale, not accuracy of the actual measurement).