The Oakton combination oxidation reduction potential (ORP) electrode measures dissolved oxygen in aqueous solutions to determine their contaminant levels and their ability to act as oxidizing or reducing agents. 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 platinum band sensor for use in oxidizing reactions (above 500mV) found in pools, spas, and municipal drinking water and in other water testing applications. The electrode is available with a single-junction reference for clean water applications, or with a double-junction reference to protect against silver wire contamination and to help prevent clogging in dirty water and solutions with heavy metals or organic compounds. Its epoxy body is impact resistant, durable, and sealed and filled with an electrolyte solution gel for minimal maintenance.

The electrode's measurement range is +/-2000mV. It has a cable with a Bayonet Neill-Concelman (BNC) connector for attaching to meters with a BNC connection. ORP electrodes, also known as redox electrodes, measure the ability of aqueous solutions to act as oxidizing or reducing agents, and they are commonly used in for water testing and food processing applications 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 be half-cell or full- (also called combination) cell type. They can be refillable or non-refillable. Housing material is typically glass or epoxy, and sensors are commonly made with stainless steel or a glass bulb. pH electrodes, which measure the pH of a substance, often have a glass bulb. The bulb senses hydrogen ions, and generates a millivoltage that is picked up by the filling solution and transferred to a wire that connects to the pH meter. ORP, also known as redox, electrodes measure dissolved oxygen in aqueous solutions to determine the level of contaminants and their ability to act as oxidizing or reducing agents. Ion selective electrodes (ISEs) respond selectively to ions in the presence of other ions. Electrodes are commonly used by researchers, manufacturers, and hobbyists in a wide variety of industries, such as aquaculture, agriculture, chemistry, food and beverage, wine-making and water-testing, and for scientific applications. An electrode can be used with a datalogger to assist in temperature measurement.

Oakton Instruments manufactures scientific instruments including meters, electrodes, and transmitters for research, industrial, and educational uses. The company, founded in 1991, is headquartered in Vernon Hills, IL.