Motorized model with mechanical counter gives greater uniformity in the test procedure and allows the operator to more closely duplicate test results in the same soil. The brass cup is suspended from an adjustable sliding holder which sets the height of the drop from a thumb screw in the back. The brass cup is easily removed for cleaning and inspection. The hard rubber base is machined on all sides. Rubber feet isolate the base from the work surface. Comes with ten ASTM plastic grooving tools.