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The HF Scientific turibidimeter has a sample cell that is approximately 2.5 cm in diameter. The diameter of the light beam is unknown, but the illuminated sample volume is certainly much larger than the PDA2000. The larger sample volume will cause the magnitude of the fluctuations relative to the dc signal to be smaller. However, the PDA2000 is not able to measure the large flocs that we create and thus.
An example of research using the PDA2000 is
[Evaluation of floc strength by morphological analysis and PDA online monitoring in Water Science & Technology Vol 56 No 10 pp 117-124 2007|.