FYI - My probe gave roughly -150 for a 7.02.
I expect “around zero” to be fine for a 7.02 solution, so this number is fine.
There is a setting update I’ll fix in the driver where the gain of different Pico boards ends up set differently - some will report about -4000 and others -8000 (2x gain) for pH 10. It’s a quick software fix to lock all to 2x.