As long as the numbers are the same, you're right, calibration is not that important. Tap water does vary, 7 - 8.3.
As far as beer, I've seen a system pushed with air have an effect on the numbers. I can't recall now, but next time we are in that account, I'll check.
I find it unreal that everyone doesn’t check the ph after every clean, either water or beer (or both). We have yet to run into any account that has seen it checked. For a $20 roll of litmus paper or an $80 tester, it could save you a pile of trouble down the road. It seriously takes 10 seconds to check.
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