42 Scientific and industrial research in relation to scientific, optical, optoelectronic, electric and electronic measuring, signaling, monitoring apparatus, instruments and devices for measuring oxygen, biomass, pH and/or CO2; Technical measuring evaluations of analyte content of oxygen, biomass, pH and/or CO2, glucose, lactose and/or ammonium; Technical consultancy in the field of measuring of analyte content of oxygen, biomass, pH and/or CO2, glucose, lactose and/or ammonium, and project planning, namely, engineering technical project planning of measuring of analyte content of oxygen, biomass, pH, CO2, glucose, lactose and/or ammonium; Development of software for conducting and evaluating oxygen, biomass, pH and/or CO2 measurements; Installation, maintenance and repair of software for conducting and evaluating oxygen, biomass, pH and/or CO2 measurements