low ph

[adidas]

I just calibrated the probe before I got these low results. Before calibration, I was between 8.3 - 8.7, as far as the probe said anyways. Does calibration solution expire? I've had it for about a year and half. It was sealed.

I'm hooking up a CA reactor soon, and want to make sure my probe works. and that my levels are good.

[Skimmerking]

Joel yes they have a exp date on them usually they are like 1-2 years after they are made. so it may be exp on the package

[adidas]

i'll have to get some more solution and re calibrate