>From: "M. G. Devour" <[email protected]>
>To do the latter, you need a standard solution that will be stable
>for a really long time and/or can be accurately replaced when needed.
>Salt recommends itself since it is available, easy to measure, cheap,
>and stable.
Can you give me a few more details? My order for the TDS-1/etc didn't
go through right away, as I'm in Canada and the order was bounced to
the Canadian office. I have to redo my order with them, and I'd rather
not spend $24 CDN ($15 US) to buy calibrating solution from them if
there is some easy obvious way of making it.
>Now we know, *FOR DONNA'S CS ONLY,* that a meter reading of 11.5
>(averaging the 11 and 12 ppm readings before and after) is equivalent
>to about 17ppm of silver as tested by the lab. Her calibration factor
>would be 17/11.5 or about 1.5.
I've read that the relationship is non-linear, so it is likely only 1.5
for readings of 11.5 ppm on your meter. But it is better than nothing.
fred
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