Such fundamental aspects have, to the best of our knowledge, so far not been considered in the ongoing research, but are vital in the search of possible applications. The purpose of this work is to illustrate the influence of plasma in-liquid on the current-voltage behavior of an auxiliary electrode in solution placed in proximity of the plasma electrode and whether this auxiliary electrode can be used to determine products formed during the plasma. In general, plasma in-liquid can be generated by different approaches. 7, Here, we focus on anodic contact glow discharge electrolysis (aCGDE), which is achieved by applying a high voltage between a gas evolving electrode and a significantly larger counter electrode. Here, Pt is used as plasma working electrode (PWE), since it was suggested to be stable under these conditions. The auxiliary electrochemical working electrode (AE) is also made of Pt, which is an intensively studied electrochemical electrode material and therefore an optimal benchmark system. Also, considering the key products that form concomitantly during aCGDE are H 2 , O 2 and H 2 O 2 , the electrocatalytic reaction of these species with Pt electrodes in alkaline electrolyte are also described in detail in the literature. A key aspect is the detection of H 2 O 2 , which is usually determined after the electrolysis by means of titration. This approach does, however, not provide any information on the spatial distribution or temporal evolution of the H 2 O 2 formed during aCGDE. Other methods are able to circumvent this issue to some extend. In total, knowing about local concentrations is for example important to understand possible structural changes of the working electrode induced by the H 2 O 2 after aCGDE. In the field of electrochemistry Pt is used as collector electrode, which oxidizes H 2 O 2 selectively, i.e., during the oxygen reduction reaction (ORR). As a proof of concept, in this work a Pt wire is placed as H 2 O 2 probe at different distances from the PWE.