The safe weighing range is the range in which the balance or scale gives the most accurate results. This range lies between a scientifically calibrated lower limit (minimum weight determined through calibration) to which a safety margin is added (defined by the selected safety factor) and the maximum limit (capacity) of a balance or scale.
Process quality requirements are met if the smallest net weight lies within the safe weighing range.
Since most manufacturers do not declare lower limits for their devices, it's important to define your tolerances to assure accuracy.