Tray Balance is mainly made according to Robway mechanism and lever principle. As a small indoor weigh instrument, it is featured with easy to operate and carry. Ideal teaching tool for chemical and physics experiments. Feature: 1. 100% brand new and high quality. 2. Achieve precision weight measurement based on lever principle. 3. Use the tweezer to clamp the weights, keep them clean and accurate. 4. Easy to operate and carry. 5. Suitable for scholastic physics and chemical experiments, an ideal teaching tool. Specification: Weighing: 200g Division Value: 0.2g Package weight: Approx. 522g / 18.4oz Package list: 1 * Tray Balance 1 * Tweezers 1 * Weight 5g 1 * Weight 10g 2 * Weight 20g 1 * Weight 50g 1 * Weight 100g