Homemade PH calibration solution

[skippyreef]

What do people use when they run out of calibration solution to calibrate their PH probes? I have a pinpoint PH monitor and I have not used it in months since I moved (just got the tank back up) and need to recalibrate it. What can I use that has a PH of 7 to do this? any help is appreciated!!

Mike

[Randy Holmes-Farley]

What can I use that has a PH of 7 to do this?

Nothing that I know of. Buying a commercial calibration fluid is the recommended way. Once you have calibrated at pH 7 and 10 (or 4 and 7), you can check it in borax, as detailed below, but you still need the calibration solutions:

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

[skippyreef]

thanks Randy! I got some tonight with a new probe and calibrated it to 7 and 10

[Randy Holmes-Farley]

Sounds good!

Happy Reefing.