(Refurbished by Superflow) SF-110 retrofit kit inspected and tested by the manufacture and works as should. Comes with monochrome computer, cables, mounting hardware, motor controller, tubing, operators manual. Upgrade your manual SF-110 bench with a retrofit kit the flow com computer has digital readout CFMS, VELOCITY, FEET PER SECOND and more. The motor controller unit regulates test pressure, also can be connect to a lab top computer that has flow bench software to capture the data. Please e-mail with questions.