A zero reading on a TDS can be as high as 1.99 uS...IF..it is reading
right so far out of it's usual range when calibrated at 300 PPM [~600 uS]
Even a good brand of TDS meter calibrated at 300 PPM can vary as much as 2
digits between meters at 5 "PPM"..so..if it hasn't been re-calibrated for
the lower ranges, the water can be as high as 8-10 uS and still read zero
PPM. [Range read error ]
Every TDS meter I sell gets checked at 10 uS [ a median of the "intended
use range" ] and adjusted as needed.
About half of them need it. Of those, it's usually one digit off at 10
uS, a few are two digits off.
Ode
At 09:58 PM 6/1/2008 -0600, you wrote:
Wayne Fugitt wrote:
And I apologize it they offended you in any way.
Accepted.
Someone stated that their meter would not go below 1.0 or similar.
That is what got my attention.
It is my understanding that a TDS meter's lowest reading is 1.0 uS. For
estimating uS of finished CS, I think Ode just said you would take the
reading and double it. I think that means a TDS reading of 1.0 uS would
also be doubled for testing distilled water?
I guess they know people will buy them if the call them what the people want.
I think I checked in with this list to see what meter would do what I need
done, and was told the TDS would not suit my purposes, so I got the PWT,
and it has served me well.
sol
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