[Herald1360]

Valise, or suitcase simply means a piece of equipment in a carrying case- think of a spy set for example. Looks like that bit is missing.

What it measures is less obvious, technical French, like technical English can use some very strange terminology in layman's language. Traversee might refer to some, sort of crossing or bridge perhaps? Maybe it's a dummy telephone line or something like that?

One for one of our Gallic friends, perhaps?