An NMR apparatus having a magnet system for generating a homogeneous static magnetic field B0 along a z direction, with a sampling head (1) comprising an RF transmitting and receiving coil system (2) and an opening (3) extending in the z direction for receiving a sample tube (4) containing a sample substance to be analyzed by means of NMR measurement, a compensation element (5) being present which at least partially compensates for disturbances in the homogeneous magnetic field B0 due to the sample substance and the material of the sample tube at the sample end of the sample tube that protrudes farthest into the sampling head during measuring operation, is characterized in that the compensation element is arranged outside the sample tube protruding into the sampling head during measuring operation of the NMR apparatus and in the z direction below the sample end, and is mounted so as to be movable, in particular displaceable, in the z direction. Thus, the compensation element can nestle against the sample tube during operation without problem. In this way, the susceptibility jump and the resulting B0 field disturbance in the lower region of the NMR-active sample liquid caused by the lower end of the sample tube are effectively minimizable with particularly uncomplicated technical means.