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Hello. In our enterprise there is the need to perform the calibration of a pH measuring system which employs smart electrodes. These pH electrodes have the electronics in the top of its body and only send a digital signal to the indicator/processor. As we can not generate this digital signal, we are not able to simulate the pH signal, so we thought to use Certified Reference Materials to solve this problem, but there is a considerations to take into account: pH electrodes degrade themselves during the measuring process, so the result of this measurement should be only valid during the calibration process So, should it be valid to acceot the result of a calibration using CRM throught time? Usually we calibrate out pH meters electrically and ALWAYS adjust them with CRM previously ti be used. We do that every day and even several times a day if an accurate measurement is need it. This is an odd case. All opinions welcomed.