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Re: TDS calibration
In a message dated 8/16/2000 7:04:13 AM, lwb at kuentos_guam.net writes:
<<
Those of you that bought one, did you also buy the calibration fluid and
if so, which one? >>
I don't think you absolutely must have the calibration fluid. These Hanna TDS
meters are very stable (as are other makes), unlike pH meters that need
calibration daily. I did get a pack of the sachets at 800 ppm for those in
our group (we purchased a dozen TDS meters) who felt they wanted a double
check. Those I checked were in no need of calibration.
Again, with TDS it is not the exact number (within reason) you need be
concerned about as much as the differences that you might encounter between
your water supply, whatever that is, and the tank of polluted water you want
to replace. Changes are necessary, or you would not be changing it, but the
magnitude of those changes must be recognized and the effects minimized. The
TDS meter will tell you whether your water change can be sudden (if the
change is small) or gradual (if the change is large). A conductivity meter
gives different numbers (TDS meters are conductivity meters with a different
scale), but again the absolute number, while significant in choosing the type
of water for specific species, is not as important as comparing two separate
waters as in water changes or new fishes being introduced.
Lee Harper
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