Аннотация:We report about the design of a spectrometer for energy spectrum measurement of an electron beam generated by a superconducting radio-frequency photoelectron gun (SRF gun), which is under construction at HZB for bERLinPro. The spectrometer shall provide energy resolution about 0.1%. The spectrometer will be also used for single shot phase space measurements in combination with a transverse deflecting cavity (TCav).