Gravity pH Meter V2.0

Hello,

I just bought pH Meter V2.0, and uploaded the code as described on the dedicated page.

The point is that I read "ph=nan" on the serial monitor, despite good wiring.

The probe is working, since I have some values returned while using another generic code. 

So it seems the issue is linked with the library.

Any idea about this please?

Kind regards.