American Weigh GeminiPRO GPR-20 Digital Milligram Scale 20g x 0.001G Weighs up to 20 grams in 0.001 gram increments Comes with protective case, tweezers, (2) 10g weights and 2 weighing trays The flip-down shield protects the delicate weighing surface Powered by 4 AAA batteries (included) Backed by a powerful 10 year warranty