We report on the design and first tests of a device allowing for measurementof ultracold neutrons polarisation by means of the simultaneous analysis of thetwo spin components. The device was developed in the framework of the neutronelectric dipole moment experiment at the Paul Scherrer Institute. Individualparts and the entire newly built system have been characterised with ultracoldneutrons. The gain in statistical sensitivity obtained with the simultaneousspin analyser is $(18.2\pm6.1)\%$ relative to the former sequential analyserunder nominal running conditions.
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