Neptune Ph probe problems

[martym]

Does anyone else have issues with theirs. I have a hard time getting it to calibrate, then when I do it only lasts for a couple days, then it is different that the Pinpoint reader that is hooked up to the cal reactor. Yes the cal reactor will measure less because of the Co2, but when the co2 has been off because of the Neptune controller shutting it off, the Pinpoint reads higher than the Neptune. It keeps the cal reactor shut off too much. I came home today for example, the tank read 7.98(neptune) the cal reactor read 8.15(pinpoint) i moved the neptune and shook it a bit, it then went up to 8.03.