The Oakton WD-35812-06 Calcium, refillable, double junction combination ion selective electrode (ISE) measures the ion concentration in aqueous solutions, and has an epoxy body for impact resistance and durability. This combination electrode contains both the measuring half-cell and the reference half-cell to minimize electrostatic interference and provide consistent readings. The double junction protects against silver wire contamination and helps prevent clogging in dirty water and solutions with heavy metals or organics.

The WD3581206 is 12 mm in diameter and 110 mm long, and has a 3-foot cable with a Bayonet Neill-Concelman (BNC) connector for attaching to meters with a BNC connection. The electrode comes with a 15 mL bottle of electrolyte solution and a pipette for refilling. The filling solution composition can be adjusted to suit the sample requirements. ISEs respond selectively to ions in the presence of other ions, and they are commonly used for water testing and analyzing biological samples in hydroponics, aquaculture, and agriculture, among other applications.

The electrode is for use with the Oakton Ion 510, pH/Ion 2100 Bench-top, or Ion Acorn meters. It can also be used with any ion meter, or any other meter with a 0.1mV resolution.