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DSL-320 MkIII – classic double pass opacity monitor for measuring visible opacity (0 – 100 %) in combustion and air filtration processes.
DSL-240 MkIII – popular single pass DDP dust monitor for measuring large diameter particulate density (mg/m³) in cement, steel and wood processes.
DSL-230M - Lloyds Type Approved smoke density monitor for measuring smoke and particulate emissions (mg/m³) in marine boiler and diesel engine exhaust gases.