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This article describes the determination of wear loss by measuring either mass change or dimensional change of lubricants and materials. It discusses the principles, advantages and disadvantages of mass loss measures and dimensional measures of wear. The article details wear measurement at the nanoscale, such as atomic force microscopy (AFM) measurement and scanning electron microscopy measurement. It reviews the techniques of wear measurement at the atomic level, namely, transmission electron microscopy (TEM) measurement and AFM combined with TEM measurement.