To subtract or add items to inventory with a barcode scanner select the Enable Scanner Check Box on the bottom frame of the CheckIn/CheckOut tab.The form below will appear. As you scan items into the scanner field the items and a quantity of 1 will be added to the list,a quantity of 1 will be added to each item per scan.You can also select the Quantity and type a value using the keyboard.MPB has been tested with the Zebex Z-3080 with keyboard wedge.