The JOBO Tank 1540 fits twice as many rolls of film as the Tank 1520. When used in rotation processing, the chemistry consumption remains the same as with the Tank 1520 in hand inversion (470 ml). Manual rotation processing is made possible with the elegant roller base included in this set. Your film processing could not be more efficient. Also included: graduates (260ml and 20 ml), 2 sets of film clips, 1 thermometer, 2 scaled bottles (1L).