This Agilent 86141B Benchtop Flexible Optical Spectrum Analyzer is used, and in excellent condition. It functions as a standard OSA when one of the two Monochrometer Output connectors are connected to the Photodetector Input via a PC-PC fiberoptic jumper cable. Features: • Optical Interface: PC • Optical Input: 9/125 µm • Photodetector Input: 50/125 µm • (2) Monochromator Outputs: 9/125 µm and 50/125 µm