In Asian countries, tomato is being considered as one of the most valuable products either in fresh or in processed form. Popular products from processed tomato are tomato juice, puree, ketchup, soup and many others. The primary processing of these products involve size reduction, extraction and finally straining to remove the seeds and pulp using the pulper finisher. Pre heating the fruit to a certain temperature is normally done to facilitate extraction. It has been found that screen sizes and speed of the pulper finisher have significant influence on the quality of tomato juice and puree. Hence, the effect of screen sizes on the quality of tomato juice will be investigated in this laboratory exercise.