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DSL-220 MkIII – traditional single pass opacity monitor for measuring visible opacity (0 – 100 %) in combustion and air filtration processes.
DSL-330 MkIII - standard double pass particulate monitor for measuring particulate density (mg/m³) in combustion and air filtration processes.
SM-202M – long established smoke monitor for measuring visible opacity and smoke emissions in marine boiler and diesel engine exhausts gases.