Abstract: The disclosure relates to a system and method for automatic sorting of natural intestines/casings for use in the production of food products, and especially as casings for sausages. A partly hollow feeding mandrel is configured to hold an intestine such that the intestine surrounds the feeding mandrel. The feeding mandrel includes a measuring area configured to transport water through a hollow part of the feeding mandrel through punctures in a surface of the measuring area, and into a cavity of the surrounding intestine. A vision device obtains images of the intestine, and a processor processes the images to sort the natural intestines or casings.