Do you reuse the same fluid every time. Then yes it will be contaminated.
I purchased a litre bottle of each from a local supplier for test equipment.
So I have no concerns in in using new fluid each time.
I also wash my probe in RO water just after each measurement and blow dry with very light air, so that I do not contaminate the next buffer I put it into.
I also then place it back in the 7 buffer after the test to make sure it does read what it was calibrated to.
I would get some new buffer solution and then recalibrate and see if it reads correctly then.
If it is not correct, then try a new probe.
Call me Paul !
Note: I am not GHL staff!
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