Balanced on a steel axis through its centre of gravity, and mounted on steel bearings on a stand. The lever is 1 meter long graduated in centimeters, and its range of motion is controlled by stops. Weights can be suspended from the lever by sliding riders carriers, and the principle of moments is studied by balancing the lever in a horizontal position under the action of different systems of weights. complete with 2 sets of slotted weights 1 gm to 50 gms.