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pH probe question

I've got my Pinpoint pH monitor electrode stuck to the side of my tank near
a corner that is covered in duckweed so algae does not seem, visibly, to be
a problem.

What should I be looking out for?  So far it's been there for about 2 months
and every day I turn the meter on for a few minutes at different times of
the day and it seems to be O.K. The pH fluctuates about 0.2 per day.

How often should this be recalibrated?

G. Kadar