Measurement apparatus for determining the relative displacement between two components (10, 20) in a direction z, comprising - a first measurement body, - a second measurement body (2, 2'), wherein the first measurement body is attachable to a first component and the second measurement body (2, 2') is attachable to a second component in each case such that movements having a direction component that is parallel to the direction z are transferable from one of the components (10, 20) to the measurement body (1; 2, 2') that is attached thereto, and - a sensor device for determining the relative position of the two measurement bodies (1; 2, 2'), characterized in that the first measurement body and the second measurement body (2, 2') are configured such that they are attachable in each case to the first component and the second component at a rigid angle, wherein at least one of the measurement bodies (1; 2, 2') is configured such that it is capable of being brought into connective contact with the first component or the second component, and the measurement apparatus is transferable from a measurement apparatus park position, in which the measurement apparatus is decoupled from the components (10, 20), into a measurement apparatus operating position and has supports (1.4, 2.4, 4.1; 1.4', 2.4', 4.1') for at least one measurement body (1; 2, 2'), and is also configured such that the at least one measurement body (1; 2, 2') can optionally assume a measurement body park position or a measurement body operating position, in which the at least one measurement body (1; 2, 2') is not guided inside the measurement apparatus during the measurement operation, wherein owing to the configuration of the supports (1.4, 2.4, 4.1; 1.4', 2.4', 4.1'), the measurement bodies (1; 2, 2') in the measurement body park position are reproducibly aligned exactly with respect to one another in the space. - a first measurement body, - a second measurement body (2, 2'), wherein the first measurement body is attachable to a first component and the second measurement body (2, 2') is attachable to a second component in each case such that movements having a direction component that is parallel to the direction z are transferable from one of the components (10, 20) to the measurement body (1; 2, 2') that is attached thereto, and - a sensor device for determining the relative position of the two measurement bodies (1; 2, 2'), characterized in that the first measurement body and the second measurement body (2, 2') are configured such that they are attachable in each case to the first component and the second component at a rigid angle, wherein at least one of the measurement bodies (1; 2, 2') is configured such that it is capable of being brought into connective contact with the first component or the second component, and the measurement apparatus is transferable from a measurement apparatus park position, in which the measurement apparatus is decoupled from the components (10, 20), into a measurement apparatus operating position and has supports (1.4, 2.4, 4.1; 1.4', 2.4', 4.1') for at least one measurement body (1; 2, 2'), and is also configured such that the at least one measurement body (1; 2, 2') can optionally assume a measurement body park position or a measurement body operating position, in which the at least one measurement body (1; 2, 2') is not guided inside the measurement apparatus during the measurement operation, wherein owing to the configuration of the supports (1.4, 2.4, 4.1; 1.4', 2.4', 4.1'), the measurement bodies (1; 2, 2') in the measurement body park position are reproducibly aligned exactly with respect to one another in the space.