In the present contribution the two normal-incidence monochromator beam lines of the Physikalisch-Technische Bundesanstalt (PTB) for the calibration of radiation sources and detectors and the characterisation of optical components are briefly described. After shut down of BESSY I these bending magnet beam lines have been transferred to the radiometry laboratory of PTB at BESSY II. Emphasis is laid on the technical aspects linked with the change from BESSY I to BESSY II such as, e.g., the out-of-plane acceptance of the synchrotron radiation to reduce the heat load on the normal-incidence optics caused by the higher characteristic energy of BESSY II bending magnet radiation compared to BESSY I.