Model acl-3 was designed for automatic measurement of Saybolt/ASTM color of petroleum products utilizing the Tri-Stimulus method as prescribed in ASTM D6045, which correlates with the conventional D156 and D1500 respectively. Just set up a sample and press the START key; the test result will be displayed on the fluorescent display module in just a few seconds, and since all the subjective judgment is eliminated, a perfect traceability is attained.