I concur with what Trem states about the Hanna PWT. I brewed a batch of CS up which read 18.1 PPM after a four day settlement an exposure to bright sunshine an cold in the frigde. Initial DW reading was .9 PPM. Lab test, (AA method) report indicated 14.8 PPM silver content. So the 14.8 PPM silver reading by the lab corresponds to approx. 86% of the reading (18.1 PPM - .9 PPM) by the PWT. Original sample still reads 18.1 PPM several weeks after lab testing.
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