An additional input or output port can be added to the side of the monochromator/spectrograph (lateral position) with an added internal flipping mirror as a port selector. A manual knob at the top of the monochromator/spectrograph would allow the user to select which port the flipping mirror would direct the light to. If an additional input port is required, an additional slit such as the Model SS80 or SS82HR (sold separately) is typically required with it unless a fiber input is used. If an additional output port is required, an additional output slit is only required if it mates to a single channel or PMT detector. Multi-Channel linear array detectors such as PDAs, InGaAs arrays, and CCDs do not require a slit. They are also advised to be mounted onto the front output port only for alignment reasons, leaving the side port for single channel and PMT detectors.