Hi James,
Not only can they be off 2% of full scale but they read only about half the
ionic portion so that takes the readings down closer to zero than the much more
accurate PWT.
Example...if the ionic content is 10 the TDS will read about 5. The PWT will
read it at about 10.
I cannot comment about different labs other than to say our tests were done at
two separate labs using AA spectrophotometry and the readings were
approximately the same. Go figger.....
Regards,
Trem
----- Original Message -----
From: James Allison
To: silver-list@eskimo.com
Sent: Monday, April 14, 2003 10:16 AM
Subject: Re: CS>Re:CS>get both kinds here
On the subject of the TDS1 tester, in my opinion, while I agree that the TDS1
"can" be off by 20ppm, in the "hundreds" of units I've tested, I have never
found one to be off by more than one or two points, unless it was actually a
faulty meter that wouldn't even read the calibration sol correctly. Just
because something has the potential to do something, doesn't necessarily mean
that it will always do so. Just because lightning "can" strike you and kill
you, doesn't mean that it will.
Again, only my opinion; the TDS1 is a great meter, and gives one a fairly
good idea of where they're sitting ppm wise if they are making ionic silver.
If one is truly a perfectionist, the only real way to tell the ppm is to send
your stuff to a lab, and even then from what I understand, if the same samples
from one batch are sent to two different labs, you're going to get two
different reports.
Yours in health,
James Allison
----- Original Message -----
From: Trem
To: silver-list@eskimo.com
Sent: Monday, April 14, 2003 9:32 AM
Subject: Re: CS>Re:CS>get both kinds here
Hi Catherine,
NO. I guess you didn't get the jist of what I said. The TDS can be off as
much as 20 or 40 at ANY reading depending on the unit's full scale. You cannot
reliably measure something in the range of .1 to 3.0 with a meter that has an
accuracy of +/- 20. It's for measuring in the range of a few hundred.
Use it to measure the amount of minerals in your tap water and it'll work
just fine.
Trem
----- Original Message -----
From: C Creel
To: silver-list@eskimo.com
Sent: Monday, April 14, 2003 9:07 AM
Subject: Re: CS>Re:CS>get both kinds here
Dear Trem,
You said:
<<It's for measuring the Total Dissolved Solids in water such as tap
water. That usually ranges from 200 to 600+ uS (microsiemens) which is just
right for the TDS meter to measure.>>
So a TDS is good for testing the quality of the distilled water we use?
Thanks!
Regards,
Catherine
