500 x 0.1 Gram Digital Pocket Scale Grain Carat Ounce Troy Pennyweight Gunpowder Gold Silver Gem Compact PRE-CALIBRATED! 5 year manufacturers warranty. Weigh in grams, ounces, grains, carats, troy ounces, and pennyweight. Includes a clear cover/weighing tray (tray measures 3 1/2 x 2 inches). Small compact design of 3 3/4 x 2 1/8 inches, Weighing surface measures 2 x 2 inches. Powered by 2 AAA batteries INCLUDED.