The invention relates to a device for checking the accuracy of a of a work spindle and / or a machine table to be carried out in a circular path, in particular a nc - controlled machine tool, with a coaxially on the work spindle of the fixing element, which can be fastened, the fixing element to be secured to the first pivot bearing with a coaxial to the main spindle which is orthogonal to the axis of rotation and a pivot axis is located for a first pivot bearing, a the measuring arm member having pivot bearings, a, the measuring arm which receives the adjusting device with a second pivot bearings with a parallel to the pivot axis of the first drag bearing pivot axis is located, a second pivot bearing with a pivot axis lying parallel to the work spindle and with a the second pivot bearing supporting the stator, wherein in the measuring arm a length measurement system for determining the distance between the two axes of rotation, wherein the length measurement system a glass rod and bearing a marking has a reading.
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