The maximum pH value is not a fixed number, but rather depends on several factors including temperature and the specific conditions involved. While the standard pH scale ranges from 0 to 14, with 7 being neutral, pH values above 14 are possible. This is supported by information from Reddit, which states that pH values below 0 and above 14 are possible, and that pH is temperature dependent, allowing for vastly different values at extreme temperatures. https://www.reddit.com/r/askscience/comments/ob6jor/what_are_the_theoretical_minimal_and_maximal/
Several sources mention "Max pH" in the context of measurement devices, such as the Milwaukee MW150 MAX pH/ORP/Temp Bench Meter, suggesting the term refers to a high-performance pH meter rather than a specific pH value. These devices are designed to accurately measure a wide range of pH levels including ones that might exceed the typical 0-14 range under certain conditions.
To reiterate, there isn't a single definitive "max pH" value. The upper limit depends heavily on the context and conditions involved in measurement. While the standard scale stops at 14, it's crucial to understand that higher values exist under certain extreme conditions.
