The kit contains all the equipment that is required for a darkroom set-up to process both 35mm and 120 roll films and prints up to 20.3 x 25.4cm (8″x10″). The universal tank includes two auto load reels allowing two 35mm films to be processed at the same time, 3 colour coded developing trays handle up to 20.3 x 25.4cm printing paper. The different colours help to ensure that each tray kept exclusively for each type of processing solution, avoiding contamination.