spirit level with a tubular glass vial which is barrel-shaped internally and graduated on its upper surface (level graduation), fixed into a metal holder and fitted with adjusting screws, vesilood torukujulise klaasampulliga, mis on seest tünnikujuline ja gradueeritud skaalaga ülemisel pinnal, kinnitatuna metallhoidikusse ja varustatuna reguleerimiskruvidega
