Ultra-rigid aluminium profile with reinforcing ribs for high stability and finger-grip openings for easy use and secure hold while working. Two vertical vials for quick readings in any position. End caps with an anti-slip stopper for a firm seat when marking. Shock-absorbing end caps the two-component material mix protects the profile against impact. Removable end caps exact positioning and marking right up into the corners. Easy to clean thanks to the electrostatic powder coating. Spirit level with two precision-milled measuring surfaces (coated from 183 cm). High-precision measuring in all positions. STABILA installation technology ensures long-term accuracy measuring accuracy in normal and reverse position of 0.5 mm/m. Equipment: 1 horizontal vial, 2 vertical vials, 2 measuring surfaces, 2 finger-grip openings.