Hyperdrive attenuators were tools used to work on hyperdrives. The Besalisk cook Dexter Jettster traded Furbogs for at least one during his time traveling the Corellian Run.
Behind the scenes[]
Hyperdrive attenuators are possibly similar to real world attenuators which are used to reduce the amplitude or signal of a device.
Sources[]
Dining at Dex's on Hyperspace (article) (content obsolete and backup link not available) (First mentioned)