The design and preparation of a new electrochemical and spectroscopic microcell is presented. Fine mechanical methods and a process to microstructure photosensitive glass were combined to build up the cell system. It works as a put-on-microcell, which can be set on any surface of interest by a self prepared microseal. The seal limits a working electrode area of less than 0.1 mm(2). All necessary electrodes, the in-and outlet of microchannels for the electrolyte as well as an optical window for in situ microscopic investigations are integrated within a reaction chamber of less than 0.2 mu l. The input of electrical and optical signals together with the possibility of a continuous elecrolyte flow allows the application of the cell in various fields such as local analysis, microstructuring and synthesis. The functionality is demonstrated at different model systems.