American Weigh Scales AMW-500I-BLK Compact Bench Scale, 500 by 0.1 G Weighs up to 500 grams in 0.1 gram increments Large Stainless Steel Weighing Surface Four Different Weighing Modes. Gram, Ounce, Troy Ounce and Pennyweight Powered by one 9V Battery (included) or AC-Adapter (sold separate) Backed by a powerful 10 year warranty