The European XFEL has taken three SASE lines successfully into operation. One of them (SASE3) is foreseen for soft X-ray radiation and two of them for hard X-rays (SASE1, SASE2). At the moment all SASE lines delivers linear polarization. To upgrade the soft X-ray line one of the requirements is the ability to obtain different polarization modes of the light: right and left circular, elliptical polarisation and linear polarization at an arbitrary angle. In the soft X-ray regime this is only possible with helical undulators because the use of a /4-plate fails. Therefore four helical undulators (called APPLE-X) [2-4] are build together with the PSI and successfully installed in SASE3 during the last shutdown 2021/2022. This poster presents the final magnetic measurement results and the measurement setup for tuning the undulators.