the present invention relates to diagnostic devices incorporating electrode modules and fluidics for performing chemical analyses . the invented devices consist of a sensor array formed on an electrode module , the sensor array being contained within a fluidic housing . the electrode module is a laminate of a perforated epoxy foil and a photo - formed metal foil with sensor membranes deposited into the perforations . the fluidic housing is an element consisting of a plastic card - like body with fluidic conduits and a sealed fluid reservoir contained in a foil - lined cavity .