I bought my TDS 1 from Utopia Silver and they claim that the accurately
calibrated it for testing home made CS. It was $40.00.
Jim
Well, Jay, there's value and there's value...
The TDS-1 from Hanna Instruments is a good bit cheaper, but it reads
from 0 to 2000 ppm. You'll be using it at the *very* bottom of its
range, which means the accuracy will not be tremendous. Sorta like
measuring grains of sand with a yardstick. Do you see what I mean?
That said, I have one and it works well enough. First, it's okay for
checking your distilled water. It ought to read about zero. Second,
it's been surprisingly accurate and stable, even when making readings
on the order of a dozen ppm. It's adequate for ballpark estimates
and comparisons from batch to batch. Anyone who wants to claim it
isn't hasn't owned one or has some other agenda.
Clearly, from the standpoint of matching the instrument's range to the
measurement you're trying to make, Hanna's PWT (Pure Water Tester) is
just a better choice. It measures to a the equivalent of a couple of
hundred ppm, I think, so you're actually in a decent part of the
thing's range when taking before and after readings on your distilled
water and CS.
This better accuracy is why it costs more.
It also is calibrated and reads in units of conductivity, microSiemens,
rather than applying some arbitrary conversion factor to report PPM.
Both meters measure the same thing... the liquid's ability to transport
electrons, ei., conductivity. Conductivity is a more honest unit of
measure to use in this context.
The TDS-1 is just calibrated differently to display ppm. To be fair
with yourself you really have to figure out a conversion factor for
your individual process. *Whatever* scale factor you use to calibrate
the TDS-1, it's not really going to give you accurate ppm readings on
your CS unless you do some other kind of testing.
Bottom line, Jay, is that we do not have to make this into rocket
science. It matters not a whit if your brew is actually 22 ppm rather
than 12, or vice versa. Use a good basic process, decent DW and pure
silver, clean and sanitary procedures, and dose for effect.
If you're in a situation where you think it's critical to know exactly
what you have, then you'll be spending a lot more than 60 bucks to
find out.
Hope that helps! You've come along really fast, Jay. Keep up the good
work.
Be well,
Mike D.
[Mike Devour, Citizen, Patriot, Libertarian]
[[email protected] ]
[Speaking only for myself... ]
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