A tool is defined as…. Something used to perform a task. Or a shiny thing you want because it’s cool looking and even though you don’t need it you might and so you have to have it.
I think it sends out or measures the different voltages to other electrical components. Music or computer. Maybe a splitter for a sailboat or camper system.
It’s the Allen wrenches used to torque head bolts on old Mercedes V8 engines. The camshaft gets in the way and this is what the Mercedes factory used to repair the engines. The engine had to have the bolts torqued warm. So you had to be quick.