Talk:Refractometer
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The following unsigned note was moved from the article page:
Please consider adding a brief mention of how an OPACITY meter measures the ability of light to pass through a liquid such as industrial process control to treat Discharge Water before dumping into the environment. It might also be of interest to see a comparision of the efficiency vs cost between inline process refractometers and Opacity metering.
This may be better just added to the "Related Topics" link.