Re: Ph Meter

[Wright Huntley <jwwiii at pacbell_net>]

Drummond Howard wrote:
> I have one of the Hanna Ph "pen" I think Ph hep, it's O.K., but you have
> to calibrate it too much.  If I was testing 100 tanks I think I would have
> to calibrate it 4 to 5 times.

Mine holds much better than that if I don't let any evaporation build up 
scale on it. If that, or other contamination, makes it drift off, I find 
that a good soak in the pH 4 solution (vinegar might work) cleans things up 
and stabilizes it again for a few months.

> 
> Just to rant a little, who in their right mind would package the Ph
> calibration solutions, which you use a lot, in a box with 5 of each and
> the TDS calibration solution, which I might use twice a year, in a box of
> 20?  Really annoying!  Fortunately I don't test the Ph that much.

That sucks!

The best bargain is the pre-mixed and color-coded solutions in pint-size 
bottles. You only need a few cc for each calibration, so the buffers last 
just about as long as a pen does. :-) I never have liked the dry test reagents.

I almost never check my tds meter. If I wanted to, it would be 
easier/cheaper to mix a known strength of grocery-store "No Salt" (KCl) in 
distilled water than to pay for standard solutions.

> 
> Drummond howard
> Gaithersburg, MD
> 


-- 
Wright Huntley -- 209 521-0557 -- 731 Loletta Ave, Modesto CA 95351

      We have a million monkeys typing on a million keyboards.
        The 'net still does not look much like Shakespeare.

                  http://www.sfbaka.net/

---------------
See http://www.aka.org/AKA/subkillietalk.html to unsubscribe
Join the AKA at http://www.aka.org/AKA/Applic.htm