The PWT is the best bad tool for the job. [You 'can' use a screwdriver for a prybar and get reasonable results]
I have 2 PWTs that agree at 20 uS but not at 10 uS. [1 uS off]
Any meter is good enough to achieve a reasonable error and that is plenty good enough.
If any are 'right on' when comparing, you won't know which one it is and PPM to uS relationships aren't even linear.
There's another error range built in there as well..the two [conductivity and PPM] are simply not the same things.
It's not a certainty that any given lab is any better.
..and it doesn't even freekin matter in the face of no dosing standards that make any sense at all...and none needed.
Taste and TE , "buds and balls", tells a good enough story to inform the intuitive senses. [eyebuds and tasteballs]
A meter puts in some resemblence of punctuation...indents the paragraphs...numbers the pages and chapters...dog ears the spot...and gives literary critics something to argue about.
[A tack hammer smashes a tick just as well as a pile driver. Maybe not quite as flat, but dead is dead.]
Ode
At 09:06 AM 5/10/2005 -0700, you wrote:
>>>>
I use three PWT meters to get an average and more accurate idea of what the actual reading is. They usually agree within a microsiemen in the 20-25 uS range. That's close enough for me. I sometimes check during the process at the mid range of 10 or so and they agree there too. And they agree in measuring the DW at startup.<<<<
Trem
----- Original Message -----
From: <mailto:odecoy...@alltel.net>Ode Coyote
To: <mailto:silver-list@eskimo.com>silver-list@eskimo.com
Sent: Tuesday, May 10, 2005 2:03 AM
Subject: Re: CS>Re: CS and PPM-levels
A Hanna PWT reads out in microseimens of conductivity. [uS]
Hanna also make TDS meters that read out in PPM.
They all work the same way and none of them directly measure PPM.
If any two identical meters read the same over their entire range, you got lucky.
They're only good for getting a ballpark number.
A ballpark number is plenty good enough.
Taste buds and a laser pen are a lot cheaper...but don't give nebulous numbers.
Ode
At 11:26 AM 5/9/2005 EDT, you wrote:
>>>>
In a message dated 5/9/05 8:49:55 AM Central Daylight Time, odecoy...@alltel.net writes:<<<<
Essentialy, double a PPM/TDS meter reading to get conductivity [uS]
uS = PPM ..in CS/EIS..after conductivity stabilizes.
Ode -- please -- are you referring to a Hanna tester here? MA
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