The Digital Bending Stiffness Tester is a professional instrument for measuring the bending stiffness of paper and paperboard. It is suitable for static bending stiffness determination of various papers, paperboards, and packaging materials. As a pioneer in adopting an LCD curve-display human-machine interface, this multi-functional tester allows the bending angle to be freely set between 1° and 90°, covering the standard 7.5° and 15° tests as well as the 90° crease stiffness test. The bending length is selectable from 5 to 50 mm in fixed steps (manual version) or infinitely adjustable from 5 to 60 mm (automatic version), and the test time can be set from 3 to 35 seconds. The instrument features automatic zeroing, real-time force-time-angle curve display, automatic measurement statistics, and printing. After testing, it returns to the initial position at high speed with an adjustable return speed of 0.55-20°/s. All performance parameters comply with GB/T 23144 and GB 22364-2018 standards, making it a standard configuration instrument for bending stiffness testing in paper mills, packaging industries, research institutes, and quality inspection agencies.