A portable, mains electricity (AC-powered) instrument typically used to scan an immunoassay reagent vehicle (e.g., test strip, cassette, or card) after exposure to a clinical specimen, to provide a quantitative, semi-quantitative, and/or qualitative in vitro determination of chemical substances and/or biological markers in a clinical specimen. The instrument detects fluorescent markers that result from the immunological reaction between the reagents and the specimen. It is mostly used for rapid in vitro diagnostic measurements at the point-of-care or in the laboratory.