Precision spirit level with a particularly wide prismatic measuring surface for aligning horizontal shafts with large diameters (e.g. in printing machines) according to DIN 877. Sturdy design made of high-quality special cast iron, textured finish. The prismatic measuring surface with an angle of 154° (or 156° with a length of 250 mm) covers horizontal shafts (depending on the model) up to a diameter of 950 mm. With housing recesses for lateral insight. The measuring surfaces are finely ground. The device is equipped with a ground longitudinal level made of glass, a transverse level and full heat protection. The scale value of the longitudinal spirit level is given on the type plate. Magnet version and special versions available on request.