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DSL-230M - Lloyds Type Approved smoke density monitor for measuring smoke and particulate emissions (mg/m³) in marine boiler and diesel engine exhaust gases.
DSL-320 MkIII – classic double pass opacity monitor for measuring visible opacity (0 – 100 %) in combustion and air filtration processes.
DSL-460 MkII - advanced double pass instrument for monitoring visible opacity (0 – 100 %) and/or particulate density (mg/m³) in combustion and air filtration processes.