9 Physical, chemical and electrical analysis, controlling, measuring and monitoring devices for determining water properties; test kits for determining water properties, consisting in particular of measuring tubes, plugs for closing measuring tubes, measuring pipettes; analysis cabinets for determining water properties, consisting in particular of physical, chemical and electrical analysis, controlling, measuring and monitoring devices for determining water properties; programmable, electrical controls for the control of process water circuits, water purification and desalination systems; components for water treatment systems, namely, water analysis devices and parts in the form of test sets for water analysis