>>    I had a few samples of my CS tested and then compared it to the test done 
>> at
>>  the lab.  My TDS showed 23ppm and the lab came back with 33ppm.  Each time I
>>  sent it out it came back with a difference of 10-12ppm.  

I don't think this meant anything.  It would have had her meter been
calibrated in some way, but it was not.  My meter needed a _lot_ or
turns on the calibration screw to get it to read correctly, and
I would guess that there is no way we can even estimate how much
error, high or low, that a particular meter has.

turf


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