The Bareiss Ball Rebound Tester is a testing device specifically for the resilience of materials such as foam ,polyurethane and other materials. The principles are in full compliance with DIN EN ISO 8307 and ASTM D3574. In the test, a 16-mm magnetic steel ball falls freely onto the sample from a specified height of 500mm. The electronic device of this instrument can display the measured value and calculate the percentage of the average value.