I tried to recalibrate my ph probe, but the readings are way off. I'm also getting an error code from my controller. I examined the probe and it does not look cracked. However, there is a bubble inside the probe that moves up and down where I turn it upside down. I never noticed it before. It is a pinpoint ph probe. When I tap the probe hard it gets a reading that seems like it could be right, but it goes away when I put it in another calibration packet. Is this thing broken? I had it on my geo reactor.