The DRK109DH manual dual head durability tester is an internationally recognized Mullen type instrument that is the basic instrument for testing the strength performance of paper and paperboard. This instrument is easy to operate, reliable in performance, and technologically advanced, making it an ideal equipment for scientific research institutions, paper manufacturers, packaging industries, and quality inspection departments. Used for testing various single-layer papers and thin cardboard with a pressure not exceeding 2000kpa, it can also be used for testing non paper products such as silk and cotton fabrics.