This paper presents testing mode, determinating and validating the mathematical equation an antimony pH sensor. The introduction offers an incursion on the mine water and a definition of the pH concept, a brief history of it and continues with a short presentation of the elements which can make a possible variant of pH measurement, more precise the variant which use pH electrode/pH sensor. In the content of the paper is exposed a theoretical synthesis of the way of testing and validation of pH electrodes/pH sensors, which makes the transition to the actual testing of the studied pH sensor. The elements used for test and also the sensor response are viewed in photographs and graphics, which helps the reader to understand the practical part. Further, in paper, are presented short theoretical considerations followed by the dependence of electrical potential sensor analysis in relation with the change in pH solutions in which it was immersed. Conclusively, the most important conclusions are accentuated after the analysis, continued with some future research directions. Conclusions highlight the paper presented results, results that are seen as an opportunity for future studies.