The meters come calibrated and they seem to have done it well.
Hannas calibration fluid is expensive and sometimes defective. [Which will
really mess with your head ]
I'd make up a batch of plain non iodized salt /distilled water, say a
quart, at some specific meter reading, say 20 uS, at a specific room
temperature..and keep that.
Pour some out into a clean sampling glass and check the meter...discard the
sample.
When checking, keep both the meter and the water in the same place over night.
Ode
At 07:27 AM 6/15/2007 -0700, you wrote:
Is the calibration solution a "must have" for the proper readout on the
PWT meter?
Pat
Ode Coyote <[email protected]> wrote:
That's what TDS meters are made for.
Metering CS is a mis-application, so the readout has to be approximately
doubled to get a ballpark idea of PPM in "silver water" as opposed to salt
and hard water.
An EC or conductivity meter is a far better meter for CS and can be read
straight up numbers in uS as PPM in "silver water".
Google:
Hanna HI 98308 "PWT" [pure water tester] or HM Digital COM-100
EC meters can sometimes be found on ebay.
For instance:
http://cgi.ebay.co.uk/Digital-Conductivity-EC-Nutrient-Meter-us-cm-NEW_W0QQitemZ280123889307QQihZ018QQcategoryZ20766QQrdZ1QQcmdZViewItem
EUR 19.99
ode
At 12:33 PM 6/15/2007 +0100, you wrote:
>Hi all, I've been Googling tds meters and only seem to be able to find ones
>for either acquarians or plumbing! Anyone any ideas for buying one in the
>UK please? TIA Dee
>
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