JJG (Light Industry) 117-2000 "Printing surface roughness instrument" standard specifies the method of verification for printing paper and Cardboard surface roughness instruments. The standard adopts the air leakage method to evaluate surface roughness by measuring the pressure difference between the sample and the measurement ring. This procedure is suitable for the first verification of the instrument, subsequent verification and inspection in use, focusing on the technical requirements of Precision, sealing, Sensors Precision and measurement ring surface accuracy of the instrument. Measurement instruments used for verification of environmental conditions are also specified to ensure the accuracy of measurement results and the Reliability of instruments.