This standard specifies the requirements for paper and Cardboard Porosity testers in detail, including test methods, inspection rules, marking, Encasement, transportation, storage, etc. The standard applies to Porosity testers designed based on the principle of Schopper test method for medium Porosity range paper and Cardboard Porosity tests. At the same time, recommendations are also made on the periodic calibration of Porosity meters. A series of normative documents are also quoted in the standard, such as Encasement storage and transportation diagrams, signs, and general technical conditions for mechanical and electrical products Encasement and light industrial machinery. Porosity meters are required to meet a series of basic requirements in terms of manufacturing, working environment and technical parameters to ensure the accuracy and Reliability of test results.