A spirit level includes a profiled body with lateral surfaces, end faces or areas, and longitudinal surfaces that form measuring surfaces running between the lateral surfaces, which project laterally over the lateral surfaces with their longitudinal edges, as well as at least one position sensor, such as a vial. An air duct passes through the handle and the nozzle, and it can be connected with a suction device via a coupling in the other end of the handle. The case has an opening through which the extension portion extends outside of the case. The stent is also coated with a poly-para-xylylene polymeric material.