Hi, I have looked for what the "PWT" means on the Hanna www.pages. Both devices mentioned below are from Hanna and are designated for measuring the conductivity. Both of them can ONLY measure the conductivity as every other ordinary conductometer does. There is nothing more. The "PWT" only means "Purity Water Tester" and determinates the device rank of accuracy in the spread of Hanna products. Nothing more. Now I understand the words "I have never seen the PWT meter showing more than one decimal place" (from Trem)... it´s correct, because it is it´s main feature - the range of the Hannah HI98308 "PWT" meter is 99,9 - 0,1 micsoSiemens with the 0,1 microSiemens resolution. If you look on the Hanna pages more carefuly, you can also find the HI98309 "UPW" meter (the UPW means Ultra Pure Water tester) with the range 1,000 - 0,020 microSiemens with the resolution of 0,001 microsiemens. So: who has the HI 98309 UPW model, he can measure the conductivity more precisely having dvo decimal places more than with the PWT model. But the UPW model is approx. 3 times more expensive than the PWT one. So, one who says: " I have measured my DW and it has 2,9 PWT tells it wrong. Correctly should be said: 2,9 microSiemens (...measured with Hanna PWT meter). You can also see simple conductivity/resistance conversion charts on the Hanna site as I already wrote about. This reminds me that I saw posted some relation between the conductance and ppm values. That seem to me incredible, because the substance (dissolved or in the colloidal estate) may have different influence to conductance of the (say) batch. For instance let´s put into the 1 cubic cm (1 ccm) of DW 2,000.000 atoms of silver. And put to another 1 cubic cm of DW 2.000.000 atoms of Si (silicium). I bet my year´s income, that the resulting conductance measurements shall be absolutely different. I swear. Or can somebody mend my opinion? Where´s the mistake? Thanks Pavel H.
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