The USDA, AMS Cotton Program has been evaluating a short fiber (SF) measurement using the Zellweger-Uster HVI. In 1997, over 83,000 samples from our supervisory checklot program were measured for short fiber. Individual HVI lines differed in the short fiber test level. Zellweger-Uster modified the HVI program to include a short fiber calibration routine. The modified program was then evaluated in 1998 in four USDA Classing Offices (Macon, GA; Dumas, AR; Lubbock, TX and Visalia, CA.) along with the Quality Assurance unit located in Memphis, TN. The average reproducibility with a tolerance of 1.0 within office was 58% compared to 57% for between office. The average reproducibility with a tolerance of 1.5 within office was 76% compared to 74% for between office. The encouraging aspect of this year's study is that the level differences observed in the 1997 evaluation appear to have been corrected by the new calibration routine.