American Weigh Scales DIA20 Digital Carat Scale, 100 by 0.005 CARAT Weighs up to 20 grams in 0.001 gram increments Includes tweezers and (2) 10g calibration weights, and carrying case Flip top cover protects weighing surface while not in use Powered by 4 AAA batteries (included) Backed by a powerful 10 year warranty