Highly accurate, ideal for gems and precious stones Sleek design Flip top cover protects weighing surface while not in use. Easy 4-Key operation Tare Feature Add-Up Feature Four different weighing units: (g, ct, dwt, gn,) Includes tweezers, (2) 10g calibration weights, and carrying case Capacity: 20g / 100ct / 308.8gn / 12.86dwt Readability: 0.001g / 0.005ct / 0.02gn / 0.001dwt Stabilization Time: 3-5 seconds Calibration Weight: Auto Calibration User Calibration with (2)10g weights (included) Platform Dimensions: 1.3" Scale Dimensions: 3.0" x 5.0" x 0.8" Power: 4 x AAA Batteries (included)