Apparently a nice vinegar has other chemicals in it, which can change the pH profile -- the number of loose H atoms? Apparently the accurate way to measure the amount of acid is to add an indicator chemical, and the slowly add a base (titrating) until all the acid has been balanced by the base and the indicator changes color. I learned from the not too technical article below.
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timeasmymeasure
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Smith, Reginald. “PH and Acidity – Their Difference and Importance in Vinegar.” Supreme Vinegar (blog), November 23, 2017. https://supremevinegar.com/2017/11/23/ph-acidity-difference-importance-vinegar/.