The verification procedure and technical requirements of the Tiber Cardboard stiffness meter are specified in the JJG (Light Industry) 57-2000 Cardboard stiffness tester verification procedure. It is suitable for Stiffness meters with a Measurement range of 0 to 500 mN · m, including initial verification and subsequent verification. The procedure describes in detail the structure of the instrument, performance requirements, Appearance inspection, three-wire to zero adjustment, pendulum Sensitivity, operation requirements of the paper clamping mechanism, and Noise level. Verification needs to be carried out under specified environment conditions, including torque indication Precision, Test speed error, etc. Qualified instruments will receive a verification certificate, and those who fail will be notified. The verification period is generally one year.