Safe mounting of lasers or theodolites on batter boards, bracket with flexible guide rail enables quick positioning and exact alignment of the measuring device over a reference point, for example when transferring axes on the construction site ? rotatable by 360°, adjustable by 7 cm, variable applications: 1. centric positioning of the measuring device on the batter board holder, 2. eccentric positioning by using the turntable and the guide rail, removable turntable for quick and easy attachment of the measuring device, robust design ? Holder, turntable and guide rail made of metal, stable attachment of the batter board holder with four screws ? on batter boards up to a material thickness of 8.3 cm, 58? threaded screw as a standard mount for rotating lasers, line lasers and theodolites, application examples: in reinforced concrete construction, in bricklaying and carpentry work ? Transferring the axes to the foundation for measuring walls, for pipeline work ? Measuring the course of the pipeline in the excavation pit