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kattsue
04/03/2008, 03:09 PM
I just got a Hanna pH monitor. Do you need to calibrate it before measuring pH? I didn't get the storage solution. What can I use put in the cap to store it?

Randy Holmes-Farley
04/03/2008, 03:24 PM
Yes. Be sure to use both pH 7 and 10 for the calibration.

You can store it in pH 7 buffer, or diluted reef tank water if you want.

I leave my pH probe in the sump 24/7, but I know that doesn't work well with the pen types.

These articles have more:

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

kattsue
04/03/2008, 04:53 PM
Thanks. Do you have to have the temperature of the buffer solution at 77F when you calibrate to have it calibrate accurately?
It says on the packet accurate +/-.01 at 77F.

bertoni
04/03/2008, 05:20 PM
For our purposes, getting the buffer solution to room temperature is close enough. Critical lab work requires more care.

kattsue
04/03/2008, 05:22 PM
My room temperature is about 68F. Is that OK?

bertoni
04/03/2008, 05:31 PM
Yep.