Aluminium rectangular profile with reinforcing ribs – for high stability and secure hold while working.Integrated anti-slip stoppers allow for a firm hold when marking – the spirit level does not slip.STABILA installation technology ensures long-term accuracy – measuring accuracy in normal position is ± 0.5 mm/m and ± 0.75 mm/m in reverse position.STABILA high-quality vials for optimum readability – highly transparent, hard-wearing acrylic glass with precision-ground inner contours and fluorescent vial liquid.Spirit level with two measuring surfaces – accurate measuring in all positions.Coated measuring surfaces protect delicate surfaces.Plastic end caps protect the profile against impact.Easy to clean thanks to the electrostatic powder coating.Equipment: 1 horizontal vial, 1 vertical vial, 2 coated measuring surfaces.