Excerpts from the report: The Fibrosampler and the Digital Fibrograph are the two most widely used instruments for obtaining length parameters of cotton fibers. These two instruments are the results of the efforts of many technologists working together over a period of more than 20 years. The purpose of this study is to evaluate the Fibrosampler as a sampling device and the Digital Fibrograph for measuring length and length distribution and to relate these measurements to processing performance and product quality.