Re: TDS3 meter arrived, findings from my experiment

I have the PWT meter from SilverGen, here is their explanation on all that and why to use a calibration solution.

From: http://www.silvergen.com/ppm_meter.htm


There are several companies selling other Hanna instruments they indicate will test Colloidal Silver but were really designed to measure TDS (total dissolved solids). As calibrated from the factory the TDS meters will normally read only about one half the PPM of ionic silver that the PWT meter will read. Most of the Hanna TDS instruments have ranges of 0-999 PPM or 0-1999 with 2% accuracy of full scale. That means the unit can be off by as much as 20 or 40 PPM at the low OR high end of the range or at any reading. If you are trying to measure Colloidal Silver at the 5-15 PPM range, it is obvious that a 20 or 40 PPM possible error is not acceptable especially if the reading is only half the actual amount of silver in the water. The PWT will not be off more than 2 PPM so you can see how much more accurate it is.

The PWT meter is the only meter that works at the accuracy and range desired to measure CS.
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