High PH...

[Bill S]

In addition... I'd never make a big pH adjustment based off of a meter. I'd double check it with a test kit of known accuracy.

[Crazyeyes]

I think reefs2you has some calibration solution.

[H2Ochem]

In addition... I'd never make a big pH adjustment based off of a meter. I'd double check it with a test kit of known accuracy.

If properly calibrated a meter is the single most accurate method to measure pH. Hands down. No reagent kit will come close.