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Apparatus and instruments for scientific, laboratory, industrial and commercial measurements and tests that are to be carried out onsite; Spectrophotometers; Optical testing instruments; Colour analysis instruments; Colour measuring apparatus; Colour testing apparatus; Colour comparison and colour standard testing apparatus; Scientific and laboratory apparatus, provided for onsite use, for comparing the colours of liquids and solids using long-standing colour comparison standards; Transparencies, films, slides, filters, glasses for use as colour comparison standards in optical and colour measurement, comparison and testing; Colorimeters; Colorimetric analytical instruments; Instruments for colour grading; Colour comparators; Comparators; Nesslerisers; Optical measuring cuvettes; Measurement cuvettes for spectrophotometry, photometry and fluorescence; Water testing apparatus; Testing apparatus for the quality parameters of water; Chemical monitoring apparatus; Chemical conditioning apparatus; Apparatus for the testing of liquid waste water; Photometers; Portable photometric test kits; Ion specific photometric analytical instruments; Apparatus for measuring parametric concentration; Data loggers for measurement and testing; Computer programs and software in connection with optical tests, colour tests, colorimetry, colour comparators, spectrophotometry, photometry, water testing and conditioning; Application software for receiving, recording, displaying, evaluating, sorting, storing and forwarding of water analysis data, customer-specific data and data relating to location and time, and for display and processing thereof in tables, text and graphics, and for preparing recommendations for action for users, including for use with mobile operating systems