Fowler High Precision Fowler's Portable Durometers are just right for testing the hardness of flexible materials such as rubber and plastics. These gages conform to shore scales. Shore Scale A Manufactured in accordance with DIN, ASTM, ISO and JIS specifications Includes reference test block, operating instructions and fitted case Applications: 30° Blunt Taper Durometers are suitable for testing soft and natural rubber products, neoprene, polyesters, soft PVS, leather, thiokol, nitril rubbers, wax, felt and more