The device A11-2 measures the draw resistance of cigarettes, filter rods and their components (such as filter plugs and hollow filters). The measurements comply with ISO 6565 standards. The device works by sucking air through the sample. A compressed air powered injector pump with a critical flow orifice sends an air stream of 17.5 ml/s through the sample. The device measures the pressure drop across the sample and displays the result in mmWG or kPa.