Measuring unit, and measuring method of measuring straightened wire-shaped or tubular material

A measuring method of measuring residual curvatures on straightened straightening good in the form of wires or tubes, which straightening good has passed through a straightening system having two series-connected roller straighteners with differently oriented straightening planes, wherein

• a rod-shaped section of predefinable length is severed from the straightened straightening good that has passed through the straightening system by way of a cutting apparatus, and
• the rod-shaped section is measured by way of a measuring apparatus that comprises a measuring device that receives a respective rod-shaped section severed from the straightening good in a measuring position and apparatuses that determine measurement data that represent a residual curvature of the straightened straightening good,
• comprising a straightening plane-specific measurement, in which curvature components determined on the basis of the measurement data are assigned to the different straightening planes of the roller straighteners.