An adjustment-free tiltsensor for application in the fields of geodesy, geophysics and geotechnics, with a tilt angle measuring range greater than .+-.5.degree. to .+-.10.degree. and an essentially enhanced angular resolution better than 1 microradiant, in which an electrolytic liquid and a gas bubble are present in a closed spirit level, the spirit level is curved over an angle of up to 360.degree., a plurality of electrode configurations each having a plurality of electrodes are arranged along the spirit level for sensing the position of the gas bubble, the electrodes are in electric contact with the electrolytic liquid, and the electrodes are connected to a first electronic circuit, by means of which the electric quantities between selected electrodes can be measured.
A slope level for measuring the slope of a surface is provided. The slope level includes a body having a front face and a back face and defining a first planar measurement surface. A transparent arced tube is disposed in an opening in the body. An aperture in at least one side of the level frame can allow for viewing of an arced tube through a clear cover protecting the tube. The clear cover may comprise a plastic material positioned between the side of the frame and filler material inside the frame and defining the groove, with the portion of the clear cover at the aperture extending outward so that the clear cover is flush with the side of the frame.
