A magnetic beta spectrometer of a new design has been built and studied. The electron optical diagram of the spectrometer is similar to that of optical spectrometers. The magnitude of the solid angle used can be varied from 0.005% to 0.8% from 4π, the corresponding resolving power values changing from 0.014% to 0.2%. The relative instrumental half-width of conversion lines does not depend on energy. The accuracy of energy determination is 0.02%. The instrument control and data recording are fully automatic. The background was reduced to 5 counts per hour.