The -RO Rear Output Option provides and additional set of either 3 or 5 binding posts on the rear housing in addition to the binding posts on the front panel.
The -RO option will normally have 3 binding posts on the rear housing. If the -K Kelvin Terminal Option is also specified then 5 binding posts will be mounted on the rear housing.
The decade resistance box is delivered with both front and rear binding posts when this option is selected. If binding posts on the front panel are not desired, this should be specified as a comment at time of order and plastic plugs will be inserted on the front panel in place of the binding posts.