The JJG 2018-1989 standard specifies the method of verification of surface roughness Measurement instruments, covering the measurement range of asperity parameters Rand R2O to 0.180μm, and the measurement range of Rparameters to 0.110μm. The standard describes in detail the main Measurement instruments included in the national Measurement Reference and their Measurement parameters, and specifies the procedures for transferring quantities from the national Measurement Reference through standard Measurement instruments to working Measurement instruments, including errors and basic methods of verification.