Various methods for potentiometric determination of the endpoint of a titration are discussed and sources of error considered. In the routine determination of salinities for dynamic‐height computation using a commercial Ag indicating electrode and Ag‐AgCl reference electrode, the equivalence point potential should first be determined with an accuracy of ten mv and the meter set to this value. The procedure of Knudsen is then followed and all samples and standards titrated to within five mv of the established endpoint potent