Everybody, Now I'm wondering if my PWT may need calibration. For one thing the de-ionized distilled water I use, which I was told is about 7.0 TDS (7.0 mg./l.) has indicated 0.2 uS on the PWT. Does this sound about right? I first thought that 7.0 TDS would read around 5.0 to 7.0 uS? Is the device haywire or am I? Reid
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