pH climbing

[rimai]

Numbers seem to be not too bad.
Is it climbing on a cup of tank water too?

[MDB1029]

So this is what it did before

Reef.png (33.99 KiB) Viewed 3282 times

And after calibrating it today it began to rise again and then just dropped to what may be the correct pH value. I tried to get a picture of the most recent chart but my computer is one step above a paperweight and can't manage to download the image.

So it seems like it is working but i can't verify the value against anything reliable.

Is there any reason you can think of why it is doing this? Do you think the probe is the problem? of code?