[APD] pH pen

[Darrell Fennell <dkfennell at yahoo_com>]

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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