Re: [APD] pH pen

["S. Hieber" <shieber at yahoo_com>]

You can get it directly from Aqaurium marine (pinpoint) or
from most on-line fish stores like Big Al's or That Pet
Place or from Milwaukee Instruments.

sh
--- Darrell Fennell <dkfennell at yahoo_com> wrote:
> I just got a digital pH pen (Coralife; not the one I
> wanted, but the LFS ordered it for me, so I took it). 
> To calibrate it, I have to test it in solutions of 7.0
> and 4.0 pH.  Where do I get 4.0 pH solution?
> 
> Thanks,
> 
> Darrell Fennell
> 
> 
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