Posted by Sam on Friday, January 22, 2010 at 11:40pm.
The particles scatter light, some of it goes to a photocell, the photocell generates a current when the photons strike the photosensitive cathode, an amplifier circuit then generates enough current to move a meter. Here is a web page you can read about it.
http://en.wikipedia.org/wiki/Nephelometer
thank you for your help
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