Efficient aluminum smelting operation requires routine but necessary measurement and control of individual cell key parameters. Two of the critical measurement and control parameters are cell temperature and bath chemistry. Bath chemistry of interest is cryolite ratio and other components such as CaF2 and Al2O3, and sometimes LiF and MgF2. Determination of these properties requires various analytical equipment and rigorous procedures from sampling to analysis. STARprobeTM, an Alcoa proprietary instrument specifically developed and designed for use in aluminum smelters, combines tedious sampling procedures and all expensive analytical equipment into one simple portable instrument for use on potroom floor. Now, the STARprobe™, together with Alcoa proprietary Integrated Pot Control system, becomes an integral technology component in Alcoa smelters for an efficient operation. This paper will update our further development in more accurately measuring alumina concentration, and also addition of property measurement including %CaF2 and %LiF when needed.