What is the potential application of the pH sensor between 3 and 4?

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I did obtain a 19F / 1H NMR probe that changes the signal in pH range 3-4. By adequate modification, I can change the range of response up to 2-0.5 or 5-4. My question is what could be a potential application of such a probe. Until now, I wanted to use these probes in MRI, however, there is a need for changes in pH 7-6.

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