It is not sour enough
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Two different questions wearing the same words
A customer saying a pickle is not sour enough is making a flavor comment. A maker measuring a pH above where it should be has a different problem entirely, and the danger is answering the second question with the tools for the first.
Flavor can be adjusted with the recipe. The acidity that makes an acidified food safe is not a flavor target and it cannot be judged by tasting, because the two do not track each other reliably across different ingredients.
What to actually do
- Measure, on a settled jar at room temperature, with a calibrated meter.
- Compare against the figure your process is built on, not against what another recipe says.
- If the product is out of specification, it is not a shelf-stable product and no amount of adjusting the next batch changes the status of this one.
Why the vinegar strength page exists
The most common cause of an under-acid quick pickle is a vinegar of unknown or lower strength, or a dilution that was not accounted for. Buying vinegar of stated strength, by the case, from a consistent supplier is a boring decision that removes a whole class of this failure.
For a ferment the cause is different: the fermentation did not finish, usually because the room was cool and the calendar was followed instead of the product. That is the endpoint page, and it is why "stopped bubbling" and "acid enough" are two separate checks rather than one.
The commercial consequence of getting this wrong
An under-acid product that went out as shelf stable is a recall conversation rather than a quality complaint, and it is the one failure on this property with that character. Everything else here costs you a batch or a customer. This one reaches further, which is why it is measured rather than judged and why the measurement is logged against the batch rather than noted and forgotten.
It is also why a process authority is worth the money. The figure you are measuring against should come from someone who established it for your product, not from a recipe written for somebody else’s.