seven-level

— I asked how they were doing and they said they couldn't figure out the T.O. and were waiting for a seven level to explain it to them. I went back to my truck and told maintenance control we'd need a seven level radio man.

— [H]e takes from the breast pocket of his khaki shirt the little seven-level screwdriver he took from Michael Amerchrome: Plastic handle insulates, so seven-level may be used as low-voltage shorting bar, though the metal pen- (pocket-) clip on the handle's side makes you wonder; large enough for a firm grip; light enough to be used as a mallet on delicate components; small diameter of shank permits its use as a probe in confined places or as a chisel to scrape away corrosion between narrow-printed circuit channels; when magnetized, the small shank can retrieve metal parts that fall into restricted spots ....