An improved New York balance still illustrates the concepts of torque and mechanical advantage, but the addition of internal sliding weight lets you eliminate the torque effects from everything but the hooked masses, including the weight hangers and the bar. Reduces measurement errors to less than 1%. Set includes a cast-iron base, a 50-cm bar with internal weight mechanism, 3 weight hangers, a 50-g hooked mass, and a 100-g hooked mass. * Instructions included. *