A Complete set that features a dual Scale, four complete weight sets (each with brass slotted weights, 2x5g, 4x10g, 4x20g, and a 20g brass weight hanger), four pulleys with clamps and two sets of strings allowing students to investigate the equilibrium of either 3 or 4 forces. A bubble level helps students with the set up and the 16 inch diameter lightweight, durable tabletop and a sturdy cast iron support allow both ease of use and accuracy.  An Activity Guide/Instruction Manual is included.