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New cell designs of coaxial microwave cavity type are reported for simultaneous electrochemical electron spin resonance measurements. Adjustable metallic shields are introduced so that the working electrode can be much shorter than the full height of the cavity. Besides the traditional helical electrode, the working electrode can be cylinders made from metallic plates, meshes, or even composite materials. The counter electrode can be placed either inside or outside the cavity. These features make the new designs more flexible than those previously reported. The impacts of eddy currents due to the magnetic-field modulation are examined and discussed. With a nonperforated cylindrical electrode, this cell can be used to determine the standard potential and the number of electrons transferred in electrode reactions involving radicals. Other possible applications are also briefed. © 2000 American Institute of Physics.