Lever Apparatus: It consists of half-meter aluminium strip with stone agate knife edge at the center. The aluminium strip is firstly painted and after that it is screen printed as 25-0-25 cm having zero at the center. Two plastic hooks, which moves along the aluminium meter scale is also provided. These plastic hooks are used for carrying slotted weights. This set up is provided on a superior quality, duco painted, and sheet metal stand but without weights.