The design and experimental characterization of a laboratory-scale uniform injection cell (UIC) are presented. The experimental cell contains a disk electrode of radius R = 0.5 cm embedded in the center of an insulating shroud. Parallel and coaxial with the disk electrode is an electrolyte injector consisting Df a porous disk of radius R = 0.5 cm that is also embedded in an insulating shroud. The counterelectrode is placed upstream of the porous disk injector. The thin gap between the parallel disks has a length L between 0.01 and 0.15 cm. Electrolyte is injected with a (nominally) uniform velocity V(0.03 cm/s less than or equal to V less than or equal to 7.2 cm/s) into the gap between the disks. Convective mass transport in the UIC was investigated for Reynolds numbers (Re = VL/nu) between 0.03 and 108 and was compared to theoretical predictions. Experimental results for low and intermediate flow rates agree with theory, but the highest-flow-rate data deviate somewhat. Measurements of the collection efficiency for a ring-disk electrode placed in the UIC also agree with theory at low and intermediate flow rates, but deviate as the injection velocity exceeds 1.7 cm/s. We suggest that the high-now-rate deviations between theory and experiments may be due to nonuniform electrolyte injection.