Colorimeter For over two hundred years color has been considered an important property in cotton evaluation because it influences the value and price of fiber. This colorimeter provides fast,accurate, and objective measurements of cotton color to mills for purchasing raw cotton and for monitoring incoming shipments. The Colorimeter 930 is the lastest in a line of Spin-lab colorimeters that have been used extensively by the United States Department of Agriculture (USDA) for preparation of grade standards which are subsequently distributed to merchants, shippers, and mills all over the world. Colorimeter For over two hundred years color has been considered an important property in cotton evaluation because it influences the value and price of fiber. This colorimeter provides fast, accurate, and objective measurements of cotton color to mills for purchasing raw cotton and for monitoring incoming shipments The Colorimeter 930 is the lastest in a line of Spin-lab colorimeters that have been used extensively by the United States Department of Agriculture (USDA) for preparation of grade standards which are subsequently distributed to merchants, shippers, and mills all over the world .