9 Laser centering devices for projecting a visible beam on a work piece when checking, aligning and cementing of optical parts; radiation-measuring instruments for measuring the intensity of ultraviolet radiation; mechanical devices, namely, dispensers of preset portions of liquids and paste-like media, namely, optical cements and optical adhesives for dosing purposes, all not for medical use; instruments for measuring liquid grinding, polishing, lapping, cooling and lubricating materials regarding density, namely, aerometers and parts thereof; instruments for measuring liquid grinding, polishing, lapping, cooling and lubricating materials regarding concentration and/or suspension of ingredients, namely, refractometers and parts thereof; instruments for measuring liquid grinding, polishing, lapping, cooling and lubricating materials regarding temperature, namely, thermometers and parts thereof; instruments for measuring liquid grinding, polishing, lapping, cooling and lubricating materials regarding pH value, namely, pH meters and parts thereof; instruments for measuring liquid grinding, polishing, lapping, cooling and lubricating materials regarding electrical conductivity, namely, conductivity meters and parts thereof; machinery, devices and instruments for measuring and checking optical components, particularly precision optical lenses and ophthalmic lenses, and parts thereof, namely, aspheric measuring machinery, topography measuring devices, interferometers, spherometer rings with gauges, measuring bars for the measurement of planity, spherometers and torometers for convex and concave surface measurement, center-thickness measuring devices for finished and blocked lenses, lensometers and measuring magnifiers; spectral-photometer; test glasses for determining the fringe defect and for checking of workpiece surfaces of lenses, mirrors and prisms; optical lenses, primarily made of glass and plastics, also for ultraviolet and infrared applications, especially ophthalmic lenses with or without coating, in particular anti-reflection coating, and precision optical lenses; lens blanks for ophthalmic lenses; vacuum-coated optical, if applicable quartz containing elements or carriers of glass, namely, discs of glass featuring vacuum-applied coatings and coatings containing quartz for testing purposes, namely, coating thickness control; vacuum-coated optical, if applicable quartz containing elements or carriers of plastics, namely, discs of plastics featuring vacuum-applied coatings and coatings containing quartz for testing purposes, namely, coating thickness control; measuring instruments for the detection of drilled holes and for obtaining the form data of ophthalmic lenses for rimless spectacles and parts thereof; measuring instruments for detecting the geometrical shape of spectacle frames and parts thereof; downloadable and recorded computer software and computer hardware for the calculation of processing data for optical parts, particularly ophthalmic lenses, for the administration and the transfer of production data to the processing machinery and for the surveillance and control of the manufacturing processes; temperature controllers for machinery used in the production of optical goods and parts thereof; pressure gauges for measuring the pressure at bladder chucks of grinding and polishing machinery; leak detectors for use with vacuum pumps; ultrasound substrate and visual inspection devices for optical goods; work benches and cabinets for clean rooms as special furniture for laboratories; magnetrons for use in coating machines