The JJG 2092-1995 standard, applicable to the verification of plastic Rockwell hardness tester of E, L, M, R scale, specifies the procedure for transferring plastic rockwell hardness values from national benchmarks to working Measurement appliances. The standard defines national benchmarks for plastic rockwell hardness units (HRE, HRL, HRM, HRR), including direct afterburner systems, dual-optical path laser interferometry systems, microprocessors, and reference indenter groups. The total uncertainty of the national benchmark is less than or equal to 0.3 HRE (3php), and the total uncertainty of the working benchmark is less than or equal to 0.4 HRE (3php). The standard details the transmission process of Hardness value, indication tolerance and method of verification to ensure the conformity and accuracy of the national plastic rockwell hardness value.