| http://www.w3.org/ns/prov#value | - SUMMARY OF THE INVENTION In accordance with the device of the present invention, the above-described and other disadvantages of the prior art are overcome by connecting variable gain means from a photometer that provides an output S where v e, being directly proportional to a parameter of a material being monitored, and e, being a dimensionless function of temperature I in degrees Kelvin.
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