42 Rental of apparatus for use in drinking, service and waste water analytics, namely, analyzers for the parameters Total Organic Carbon (TOC), Chemical Oxygen Demand (COD), Biochemical Oxygen Demand (BOD), Total Nitrogen (TN), and the toxicity of the water and replacement parts therefor, measuring apparatus, namely, analyzers for the parameters Total Organic Carbon (TOC), Chemical Oxygen Demand (COD), Biochemical Oxygen Demand (BOD), Total Nitrogen (TN), and the toxicity of the water for process monitoring, in particular processing of liquids, and replacement parts therefor, engineering services, in particular development and operation of apparatus for use in drinking, service and waste water analytics, and parts therefor, measuring apparatus for process monitoring, in particular processing of liquids, and parts therefor, and development of hardware for the aforesaid apparatus being engineering services; development of computer operating programs for apparatus for use in drinking, service and waste water analytics, and measuring apparatus for process monitoring, in particular processing of liquids