Spirit level i.e. laser spirit level, has optical signal generator provided in housing for generating projection line on reference surface, where housing defines two reference levels, which run perpendicularly to each other

摘要

The spirit level has a housing (10) made of a metallic material, and an optical signal generator i.e. laser beam generator provided in the housing for generating a projection line (26) on a reference surface. The housing defines two reference levels, which run perpendicularly to each other. The optical signal generator clamps an optical level (24) that stands perpendicular to one reference level. The projection line marks an intersection line between the optical level and the reference level. The housing defines a third reference level parallel to the former reference level.