Previous Beltwide papers have demonstrated the principle of rapidly measuring fibre fineness and maturity using the Cottonscan instrument developed in Australia by CSIRO. For simplicity this previous work used sliver samples to demonstrate the principle and method. An automated sample preparation device has now been developed for the Cottonscan instrument which has made possible the rapid measurement of average fibre fineness for samples of ginned lint. Three stand alone instruments including their corresponding sample preparation modules are now functional. This paper will present the results of trials conducted to determine the instrument's throughput, accuracy and precision of results between instruments for a range of lint samples.