pH sensors with constant capacitive slope, reference filled with concentrated stable SOLUTION "D" and calibrated meters by special SOLUTION A=7.00 and D=4.67 have a linear scale and holds for years. Actual science and historical search on pH metry The constant "capacitance slope" [20] ?mV/?pH (c2) of pH sensors, treated by high concentrated pH buffer formation and internal filling electrolyte was observed. Already the glass electrodes with reference electrodes from Moller [33] and to-day some more brands have been observed to be very stable by the better definition with the new in- and outside filling electrolytes SOLUTION A and D. The sensors look to be like electrolytic condenser [20]. Zero (c1, ?pH) and slope (c2) are kept stable by the mechanism (-?G FERMI function) for years [41].
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