An electrochemical test device is provided for determining the presence or concentration of an analyte in an aqueous fluid sample. The electrochemical test device includes a working electrode and a counter electrode made of an amorphous semiconductor material. The working electrode is overlaid with a...http://www.google.de/patents/US6001239?utm_source=gb-gplus-sharePatent US6001239 - Membrane based electrochemical test device and related methods
