SI Manufacturing Primary/Junior School BalanceThis durable balance will aid in determining mass of liquids and solids. The buckets come in a clear plastic for easy measurement and are shaped to help in the centering of the materials. The Balance comes with a plastic weight set (2 x 20 g, 4 x 10 g and 8 x 5 g) and a metal weight set (2 x 1 g, 2 g, 5 g, 10 g, 20 g and 1 x 50 g). Activity guide included. Grades 1 7.