is there an equipment (a method) to measure tissue pH from outside (e.g. percutaneous) ?

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Jai Ghosh

An extremely helpful article:

John B Das, Indira D Joshi, N C Joseph Lai, Arvin I Philippart (1986)

Chapter 34 – Percutaneous monitoring of tissue pH with a polymer membrane pH transducer

Proceedings of the Second International Conference on Fetal and Neonatal Physiological Measurements, 1986, Pages 227–234

DOI: 10.1016/B978-0-407-00451-1.50036-9

Virendra Kumar Saxena

It is better to dissolve in hot pyridine, phenol, cresol or formic acid.