9027 (01/1988-..) Instruments and apparatus for physical or chemical analysis, e.g. polarimeters, refractometers, spectrometers, gas or smoke analysis apparatus, instruments and apparatus for measuring or checking viscosity, porosity, expansion, surface tension or the like, instruments and apparatus for measuring or checking quantities of heat, sound or light, incl. exposure meters, microtomes

90271010 (01/1988-..) Electronic gas or smoke analysis apparatus 90271090 (01/1988-..) Non-electronic gas or smoke analysis apparatus 90272000 (01/2000-..) Chromatographs and electrophoresis instruments 90272010 (01/1988-12/1999) Chromatographs 90272090 (01/1988-12/1999) Electrophoresis instruments 90273000 (01/1988-..) Spectrometers, spectrophotometers and spectrographs using optical radiations, such as UV, visible, IR 90274000 (01/1988-12/2006) Exposure meters 90275000 (01/1988-..) Instruments and apparatus for physical or chemical analysis, using UV, visible or IR optical radiations (excl. spectrometers, spectrophotometers, spectrographs, and gas or smoke analysis apparatus) 90278005 (01/2007-12/2021) Exposure meters 90278011 (01/1988-12/2019) Electronic pH meters, rH meters and other apparatus for measuring conductivity 90278013 (01/2000-12/2019) Electronic apparatus and equipment for performing measurements of the physical properties of semiconductor materials or of LCD substrates or associated insulating or conductive layers during the semiconductor wafer production process or the LCD production process 90278015 (01/1995-12/1999) Electronic apparatus and equipment for performing measurements of the physical properties of semiconductor materials or associated insulating or conductive layers during the semiconductor wafer production process 90278016 (01/1998-12/1999) Electronic apparatus for performing measurements of the physical properties of LCD substrates or associated insulating or conducting layers during the LCD production process 90278017 (01/1998-12/2019) Electronic instruments and apparatus for physical or chemical analysis or for measuring viscosity, porosity, expansion, surface tension or the like, or for measuring heat, sound or light, n.e.s. 90278018 (01/1995-12/1997) Electronic instruments and apparatus for physical or chemical analysis or for measuring viscosity, porosity, expansion, surface tension or the like, or for measuring heat, sound or light, n.e.s. 90278019 (01/1988-12/1994) Electronic instruments and apparatus for physical or chemical analysis, or for measuring or checking viscosity, porosity, expansion, surface tension or the like, or for measuring or checking quantities of heat, sound or light, n.e.s. 90278020 (01/2020-12/2021) pH meters, rH meters and other apparatus for measuring conductivity 90278080 (01/2020-12/2021) Instruments and apparatus for physical or chemical analysis or for determining surface tension or the like, or for measuring heat or sound, n.e.s. 90278091 (01/1988-12/2019) Non-electronic viscometers, porosimeters and expansion meters 90278093 (01/2000-12/2010) Apparatus and equipment for performing measurements of the physical properties of semiconductor materials or of LCD substrates or associated insulating or conductive layers during the semiconductor wafer production process or the LCD production process, non-electronic 90278095 (01/1995-12/1999) Non-electronic apparatus and equipment for performing measurements of the physical properties of semiconductor materials or associated insulating or conductive layers during the semiconductor wafer production process 90278096 (01/1998-12/1999) Apparatus for performing measurements of the physical properties of LCD substrates or associated insulating or conducting layers during the LCD production process, non-electronic 90278097 (01/1998-12/2010) Non-electronic instruments and apparatus for physical or chemical analysis or for determining surface tension or the like, or for measuring heat or sound, n.e.s. 90278098 (01/1995-12/1997) Instruments and apparatus, other than electronic, for physical or chemical analysis or for determining surface tension or the like, or for measuring heat or sound, n.e.s. 90278099 (01/2011-12/2019) Non-electronic instruments and apparatus for physical or chemical analysis or for determining surface tension or the like, or for measuring heat or sound, n.e.s. 90278100 (01/2022-..) Mass spectrometers 90278910 (01/2022-..) Exposure meters 90278930 (01/2022-..) pH meters, rH meters and other apparatus for measuring conductivity 90278990 (01/2022-..) Instruments and apparatus for physical or chemical analysis or for determining surface tension or the like, or for measuring heat or sound, n.e.s. 90279000 (01/2020-..) Microtomes, parts and accessories of instruments and apparatus for physical or chemical analysis, instruments and apparatus for measuring or checking viscosity, porosity, expansion, surface tension or the like, instruments and apparatus for measuring or checking quantities of heat, sound or light, and of microtomes, n.e.s. 90279010 (01/2017-12/2019) Microtomes 90279050 (01/1998-12/2019) Parts and accessories of instruments and apparatus for physical or chemical analysis, e.g. polarimeters, refractometers, spectrometers, of instruments and apparatus for measuring or checking viscosity, porosity, expansion, surface tension or the like and of instruments and apparatus for measuring or checking quantities of heat, sound or light, incl. exposure meters, n.e.s. (excl. of gas or smoke analysis apparatus) 90279080 (01/2017-12/2019) Parts and accessories of microtomes or of gas or smoke analysis apparatus, n.e.s. 90279090 (01/1988-12/1997) Parts and accessories for microtomes, n.e.s. 9028 Gas, liquid or electricity supply or production meters, incl. calibrating meters therefor