902710 Gas or smoke analysis apparatus
902720 Chromatographs and electrophoresis instruments:
902730 Spectrometers, spectrophotometers and spectrographs using optical radiations (ultraviolet, visible, infrared):
902740 Exposure meters
902780 Other instruments and apparatus using optical radiations (ultraviolet, visible, infrared)
902790 Microtomes; parts and accessories(Polarimeters, Spectrometers, Luxmeters)