Mettler Toledo's JS Series gram scales are feature-packed scales that offer one-touch calibration, statistics, totaling, recall, piece counting, percent weighing, free factor and diagnostics. Scale is Legal-for-Trade in the United States. Weighing modes include ct, g, mg, kg, lb, oz, toz, dwt. Scales run on batteries or included AC adapter. This model JS303G/A has a maximum weighing capacity of 320g x .001g.