A wall-jet electrode reactor possessing a laminar flow regime, suitable for mechanistic studies, is reported. This reactor is different from those described in the literature in the size of its working electrode surface area. The reactor is evaluated by means of mass transport-limited current measurements using as a model reaction the reduction of ferricyanide ions at a platinum electrode surface from a 0.01M K3Fe(CN)(6)-0.01M K4Fe(CN)(6) solution containing 1M KCl as supporting electrolyte. The dependence of the mass transport-limited current on the crucial reactor parameters - the volume flow rate V-f (m(3) s(-1)), the nozzle diameter a (m) and the radius of the working electrode R (m) - is established and verified by theoretical predictions. The reactor is shown to have the desired wall-jet hydrodynamics for : 1.6 x 10(-6) less than or equal to V-f less than or equal to 4.3 x 10(-6)m(3) s(-1), 1.5 x 10(-3) less than or equal to a less than or equal to 3 x 10(-3) m and 1.5 x 10(-2) less than or equal to R less than or equal to 2 x 10(-2) m.