The SRF Photoinjector Test Stand Ts4i is used for the characterization of the beam properties provided by a superconducting RF (SRF) photoinjector. It is the ideal testbed for the study and development of all the different SRF photoinjector setups operating at 1.3 GHz. Ts4i serves for the final qualification of SRF photoinjector cryostat assemblies before releasing them for installation into the European XFEL CW injector.