Electro Sensors Inc. is engaged in two distinct operating segments, the manufacture and distribution of industrial production monitoring and process control systems through its Controls Division, and the development and distribution of PC (personal computer)-based software for both automated survey processing and hand printed character recognition through its AutoData Systems Division. In addition, through its ESI Investment Company subsidiary, the Company periodically invests in other businesses and companies. In December 2002, the Company released AutoData ExpertScan software to its customer base. ExpertScan has handprint, optical mark and barcode recognition capabilities. As with its Survey Plus 2000, ExpertScan automates survey and form processing, as well as tabulation of results.