Does Keysight have a recommended solution for inspecting the output ferrules?

Keysight does not offer a visual ferrule inspection tool as part of its' product line. However, there are several manufacturers of devices referred to as hand held microscopes, or fiber borescopes, or fiber optic inspection tools that can be used to inspect the fiber optic ferrule interfaces on Keysight's instrumentation. These products and their manufacturers can be located within various trade publications and buyer's guides. Note that flat contact and angled contact input and output ferrules require different inspection strategies. Refer to Keysight's pocket guide, "Cleaning Procedures for Lightwave Test and Measurement Equipment," when inspecting instrument output/input ferrules. This guide is available at www.agilent.com. Simply search on the title of the document or its literature number "5963-3538F".