1.1 These test methods cover the determination of the Vickers hardness and Knoop hardness of metallic materials by the Vickers and Knoop indentation hardness principles. This standard provides the requirements for Vickers and Knoop hardness machines and the procedures for performing Vickers and Knoop hardness tests. 1.2 This standard includes additional requirements in annexes: Verification of Vickers and Knoop Hardness Testing Machines Annex A1 Vickers and Knoop Hardness Standardizing Machines Annex A2 Standardization of Vickers and Knoop Indenters Annex A3 Standardization of Vickers and Knoop Hardness Test Blocks