Calibration solution for ph probes

[The Saltman]

Hi guys,

Is there anything else I could use to calbrate a ph probe besides the calibration that you buy?

[Randy Holmes-Farley]

No, not really. You can check it in a borax solution, but you'lll still need at least one other pH calibration fluid.

Borax
http://web.archive.org/web/20021015005420/www.animalnetwork.com/fish2/aqfm/2000/feb/bio/default.asp

Measuring pH with a Meter
http://www.advancedaquarist.com/issues/feb2004/chem.htm

A Comparison of pH Calibration Buffers
http://reefkeeping.com/issues/2005-02/rhf/index.htm