Abstract
A varied assortment of forty-seven new and used steel, ceramic, chromium carbide and tungsten carbide gauge blocks from nine manufacturers, ranging in length from 0.5 mm to 101.6 mm, were calibrated by four laboratories from the NORAMET countries using the method of optical interferometry. Measurements of central length of the gauge blocks are compared. The data are utilized as a test bed to illustrate the outcome of two different techniques with potential for application in comparisons of the calibration services of national metrology institutes (NMIs).
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