English to French Tech/Engineering Electronics / Elect Eng

"In a flipper/roller style indicator, flippers are industrial grade indicators, which consist of a series of metal flags, silver on one side and red on the other. They are housed in a rugged, hermetically sealed aluminum housing with a recessed glass window. Each flag rotates on a ceramic and stainless steel bearing surface, which eliminates sticking or hanging up.
Flipper assemblies are built to the length of the level gage in one continuous piece up to 15 feet with no joints or blind spots."

Thought of "zone morte".