Measure the rebound resilience of a rubber test piece with one of our specialist resilence instruments. Lüpke Pendulum The Lüpke Pendulum measures the rebound resilience of rubber, which is defined as the ratio of returned energy to input energy when a steel rod strikes the test piece. Dunlop Tripsometer This apparatus consists of a pendulum in the form of steel disc, mounted on frictionless air bearings, with a striking ball. The Tripsometer measures resilience as the ratio of returned energy to input energy when rubber is struck by the ball. MRPRA - Wallace Rebound Resiliance Data Computer Can be used in conjunction with either of the above products to make accurate results even simpler to achieve.