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Wilson Knoop Test Block 500 to 1000 grams. Direct traceability to NIST. Calibrated in accordance with ASTM E-384. Specify load and approximate hardness +/- 20 when ordering.
Used to check the accuracy of Knoop / Vickers testers, Wilson® Hardness test blocks set the standard for the industry. Available in a comprehensive range of nominal hardness values and load force applications, Wilson Hardness Knoop and Vickers test blocks are highly polished, precision calibrated, and are certified to meet all relevant ASTM and ISO standards.
