Hi everyone,

my previous pH probe is pretty old, so I bought a new one, but calibration is not working as I remember.

My questions:

-during the calibration process, when probe is in fluid 7, should the sensor show 7 when PL is telling me to switch to fluid 10?
And show 10 when it's asking my if I want to save?

It's not for me (7.28 when asked to switch to fluid 10, and 10.25 when asked if I want to save).
Probe shows 10 and 7 when put into the calibration fluids right after calibration, but is way off the next day (7.27 in 7 and 10.24 in 10, which were the about the numbers it showed "during" the calibration process).

Any ideas?