--- Begin Message ---
Tai-Pan wrote:
>
> For those who weren`t around back when we all started using TDS-1
> testers. :-)
> Tai-Pan wrote:
> >
> > Greetings all you CS makers and users.
> > Was reading the postings of Ringdance on Wed 1 Apr, and Fred on 2 Apr
> > about their TDS-1 testers.
Question regarding the TDS-1. I've just placed an order for the Hanna
DIST-1 which is a bit more expensive than the TDS-1. The reason that I
did so was because the specs on the TDS-1 claimed a margin of error of +
- 10 ppm. Not good if we're trying to measure in the 1 - 50 ppm range.
Big diff between 5 ppm and 15 ppm. The DIST-1, however, has a margin of
error of 2% flat across the scale. That means that at the top end of
2000 ppm it will be + - 40 ppm and down in our range of interest it will
have a margin of error of + - 1 ppm at a 50 ppm concentration. I
confirmed all this with the tech specialist at Hanna. Did I miss
something here? I don't see how one could have confidence in the TDS-1
readings at very low ppm concentrations.
--
The silver-list is a moderated forum for discussion of colloidal silver.
To join or quit silver-list or silver-digest send an e-mail message to:
[email protected] -or- [email protected]
with the word subscribe or unsubscribe in the subject: line.
To post, address your message to: [email protected]
List maintainer: Mike Devour <[email protected]>
--- End Message ---
