This tester readily measures the stiffness of paper and paperboard. Features a high precision: a pendulum gives flexural loads to the specimen. Use of an auxiliary weight or a correcting element widens the measurement range, increasing sensitivity and reproducibility. One end of the specimen is held on the pendulum rotating axis, while the other end is positioned between a pair of rollers that turn with the loading disc to exert flexural loads on the specimen. The loading point (rotation angle) is read on the outer scale disc when the specified deflection angle, 15 or 7.5 degrees, is reached.