Transmissometers; Opacity monitors; Scattered light meters; Spectrometers; Photometers; Dust monitors based on transmission light, scatter light, or combinations of transmission light and scatter light; Flame ionization detectors; Gas analyzers for laboratory and industrial purposes; Analyzers for analyzing hydrocarbons; Liquid analyzers and water analyzers; Gas and liquid leak detectors for detection of leaks in gas and liquid pipelines; Oxygen sensors for laboratory and industrial purposes;...