Stiffness Tester is a consistent tool useful to measure stiffness or flexural rigidity of paper and paper board. Stiffness Tester is used to determine the resistance of paper and paper board to bending. The economic value of paperboard highly depends upon its bending resistance or stiffness. This is a Taber Type Instrument. The specimen is moved in left and right direction as per Taber guideline. PRESTOStiffness Tester is designed as per standards TAPPI –T489 OM-08