high-quality telescopic system for extending the measuring surface, the spirit level can be flexibly extended to the required length, marking edge over the full length, measure and mark in one operation, even when extended, imprinted metric scale for determining internal dimensions and clear dimensions, LOCK system for fixing the set length, unintentional adjustment of the spirit level is prevented, integrated slip stoppers ensure a firm seat when marking ? no slipping of the spirit level, high-quality extension mechanism ensures high measurement accuracy, in normal position: closed ± 0.5 mmm and extended ± 1.0 mmm, in reverse position: closed ± 0.75 mmm and extended ± 1.0 mmm, plastic end caps protect this Profile in blows, application in carpentry work ? the pull-out spirit level covers most of the standard dimensions of kitchen cupboards, in door and window construction: determining interior dimensions and aligning window and door frames, in sanitary installation: installing showers and bathtubs of different sizes, in masonry work and in reinforced concrete construction: measuring windows - or door lintels and control of the bearing surfaces