The Tintometer AF710-3 is a visual colorimeter approved by the American Oil Chemists Society (AOCS) for color measurement of oils, fats and tallows according to AOCS Cc 13b-45, the Wesson Method. Color is determined by obtaining a visual color match for the light transmitted through a column of the sample with that transmitted through a series of red and yellow color standards calibrated in accordance with the AOCS-Tintometer Color Scale. 110 Volt.