Micro spirit level for accurate measurements of inclination and adjustments

As a rule, spirit levels which are used for horizontal and vertical measuring and aligning consist of a rod-shaped housing having two bubble levels for the horizontal and vertical measurement. Technically extended devices are also equipped with rotatable angle-of- inclination bubble levels. However, the measuring accuracy - scale resolution/readability - of these measuring tools is unsatisfactory and inadequate for accurate measurements. A further disadvantage are the frequently unintended maladjustment due to a change in position of the bubble level elements which in most cases are screwed in. This invention counteracts these defects by the fact that the elongated segment-area bubble level (6) of different segment shape in radius and arc length and integrated as indentation in the spirit level body (10) consisting of transparent plastic and which is provided with the pin (8) for stiffening and is closed with the cover (9) which is also transparent and is welded over its area, corresponds to the curvature of two large and oppositely directed circular arcs with the scales (4 and 7). For course measurements, the full-circle and box bubble level (5) is also allocated to this micro spirit level. At the same time, the invention provides to insert a sphere as rolling reading marker in the bubble levels as an alternative.