The Oakton WD2750430 Refillable Combination Sodium Ion-Selective Electrode (Blue Epoxy) is a fast and accurate electrode that does not require an external reference application, whether the application involves end point determinations in potentiometric titrations or continuous monitoring of specific ions. The WD-27504-30 is easier to use than separate sensing and reference half-cell electrodes. This double-junction combination ion-selective electrode is convenient to use in places where two electrodes will not fit.

The WD-27504-30 electrode has a durable epoxy body and is well-suited for portable field applications. Its outer reference chamber is silver-free and resists contamination; it is also refillable.