Last year when I test the ph of my must I did not get a good reading.
the number kept bouncing around and I took several readings with
wildly different results. My conclusion at the time was that I needed
to recalibrate my meter, and maybe troubleshoot the electrode. This
year I have taken the time to test the meter and probe (same ones) and
I am very accurate at 4.00, 7.00 and 10.00ph. It made me wonder if my
testing method is to blame. So my question is: do I need to do
anything special with my sample before measuring ph? Should I filter
it to remove particulates? should I stir it well first?
I appreciate your comments.

Thanks
Marc

I never take any special steps when testing pH. I just make sure to
have a sample large enough to cover the end of the probe.

Greg G.