Re: Ph meters and kits

[Dave Gomberg <gomberg@wcf.com>]

Gee, there are dozens of pH indicator reagents.

Bromthymol blue is good from 6.0 to about 7.4
Actually Hach suggests using it down to 5.5 with their color disc.
 From 3.0-5.0 use 2,4 Dinitrophenol
 From 5.2-6.8 use Bromcresol purple
 From 5.5-7.5 use Bromthymol blue

These kits are over $50 each for the wheel, but the cost per test is very 
cheap.

Or just forget the whole thing and use a digital.   About $100 down and $50 
per year.


At 12:04 PM 3/25/01 -0700, you wrote:
>Colin,
>
>The main problem with most chemical test kits is that they don't read low
>enough. Test strips that do go low enough are labeled at 0.5 pH increments
>(too coarse for me). Tetra's low range test kit used to go to 4.8. Does
>anyone know of a commonly available test kit that goes to 4.5 or lower?
>
>Mike Wise
>
>"M.LIEBANES" wrote:
>
> >
> > As far as kits are concerned, I use aquarium pharmaceuticals' kit, what
> > do you lot all use?
> >
> > C:-)lin
> >
> >
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--
Dave Gomberg, San Francisco       gomberg at wcf dot com
NEW Planted Aquaria Magazine:        http://www.wcf.com/pam
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