This Standard applies to inclination and orientation measurements which are carried out in the field in connection with investigations in soils and rock masses according to DIN 4020, DIN EN 1997-1 and EN 1997-2 and at or in structures by means of inclinometers and deflectometers. It is to be applied in association with DIN 4107-1. In particular, this Standard applies to field measurements carried out for: - identification of shear planes acting in soil and rock masses; - monitoring of the stability of geotechnical structures ahead of, during and after construction (e. g. natural slopes, slope cuts, embankments, excavation walls, foundations, dams, refuse dumps, tunnels); - monitoring of displacements in soil and rock (e. g. for comparison of measured and predicted values in connection with the Observational Design method in accordance with DIN 1054 and DIN EN 1997-1, and for checking of the geotechnical design values); - deduction of geotechnical design values (e. g. trial loading; trial tunnelling); - survey of the direction and inclination of boreholes; - verticality proof of structures or its components (e. g. slurry trench walls) Instruments, others than inclinometers and deflectometers, which have been primarily designed for measuring the direction and inclination of oil wells (e. g. gyro, magnetic and multishot probes) are for geotechnical displacement measurements generally not sufficiently accurate and are not subject of this standard.