Fison Liquid Limit Apparatus drops the disc at 120 strikes per minute through a 10 mm drop distance, driven by an electric motor with automatic and manual mode switching. A built-in automatic counter tracks the strikes, and the brass dish gives a non-corrosive, stable surface for the soil paste while the rubber and plastic pedestal absorbs impact. As a Casagrande liquid limit device, it determines the liquid limit of soil by counting the strikes the sample needs in the dish.