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The Thermo Scientific Orion IonPlus Sure Flow electrode is a refillable combination ion selective electrode (ISE) with a solid-state sensor for measuring the ion concentration in aqueous solutions. This combination electrode contains both the measuring half-cell and the reference half-cell to minimize electrostatic interference and provide consistent readings. It has a double-junction reference to protect against silver wire contamination and help prevent clogging in dirty water and solutions with heavy metals or organics. The junction can be flushed to expel contents by pressing on the cap, preventing clogs and contamination. The electrode has a durable, impact-resistant epoxy body and is refillable, allowing the filling solution composition to be adjusted to suit the sample requirements. The electrode is available in a variety of models that measure specific ions to suit different applications. It operates in temperatures from 0 to 80 degrees C (32 to 176 degrees F), is 13mm in diameter and 110mm long, and has a 1m cable with a waterproof Bayonet Neill-Concelman (BNC) connector for attaching to meters with a BNC connection. 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. An electrode, also called a sensor or probe, is an instrument used with a meter to test and measure parameters of a substance. All electrodes are probes or sensors, but not all probes are electrodes or sensors. Probes, such as temperature probes, are used to penetrate a material for measurement. Common electrode types are pH, total dissolved solid (TDS), oxidation reduction potential (ORP), and ion selective electrode (ISE). They come in standard models or in all-in-one (sometimes called 3-in-1) models, which have a built-in temperature sensor for automatic temperature compensation (ATC). Electrodes can