Specific Gravity and Water Absorption Sampling Testing Machine he buoyancy balance system consists of a rigid support frame, incorporating a water tank mounted on a platform.A mechanical lifting device is used to raise the water tank through the frame height immersing the specimen suspended below the balance.The balance supplied may also be used as a standard weighing device, thus providing a versatile and comprehensive weighing system in the laboratory least count .1gm, provision is made in this balance to suspend density basket under material pan. This balance is mounted on an angle iron frame stand.