This ultra-precision carat scale for the jewel expert weighs up to 50 gr. with 0.001 gr. accuracy. It is very nicely-presented in a soft, zipped storage/carry-case and includes both 20 gr. and 50 gr. weights, tweezers and a gem tray. It features an auto cut-off after 180 seconds (3 minutes). 2 x AAA batteries are included so you can get weighing almost immediately. Optional AC wall adapter.This jewel scale will weigh the following units: Grams (gr), Ounces (oz), Troy Ounces (ozt), Pennyweight (dwt), Carats (ct), Grains (gn)Net weight: 176 gr. Dimensions: 13.6 x 7.5 x 5.1 cmThis precision scale comes with a 3 year warranty.