9 Measuring apparatus, namely, sizers for glasses; measuring apparatus and instruments, namely, measuring glassware; signalling apparatus and instruments, namely, level sensors; checking apparatus and instruments, namely, level indicators for monitoring and controlling liquids in tanks and vessels; chromatography columns for laboratory use, in particular immunoaffinity and purification columns, SPE columns, GPC columns and HPLC columns; apparatus and instruments for recording, transmission, reproduction or processing of sound, images or data; downloadable computer software for chromatographic analysis; Scientific apparatus and instruments, namely, chromatography columns for use in purification in the laboratory and parts and fittings therefor