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    Vickers and Knoop Hardness Testers are used for measuring the hardness of metals, both ferrous and non-ferrous. The Vickers and Knoop indentation hardness test consists of two steps: The applicable specified indenter is brought into contact with the test specimen in a direction normal to the surface, and the test force F is applied. The biggest difference between Vickers and Knoop hardness testing is the design of the indenters. The Knoop method only penetrates the specimen half as deep as the Vickers pyramid indenter. The Knoop technique is used for testing brittle materials such as ceramics.
     
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