Thomas Glass Body Combination Spear and Gel pH Electrode - 2 to 13 pH Range for Water Testing, Aquariums, and Laboratory Use

The Thomas combination pH electrode measures the pH levels of aqueous solutions, and it is available in a variety of models to meet the needs of different applications. This combination electrode contains both the measuring half-cell and the reference half-cell to minimize electrostatic interference and provide consistent readings. It is available with an epoxy body for impact resistance and durability, or with a glass body that resists corrosive materials and solvents. The electrode's measurement range is 0 to 14 pH, except for the spear tip model 102834 (1235B68) which has a range of 2 to 13 pH. The electrode has a plug head for use with a Bayonet Neill-Concelman (BNC) cable assembly (sold separately), except for 102830 (1235B64) which has a 1m cable with a BNC connector for attaching to meters with a BNC connection. pH electrodes measure the acidity or alkalinity of a substance and are commonly used by researchers, manufacturers, and hobbyists in hydroponics, aquaculture, agriculture, and winemaking, among other applications.The 3-in-1 model 102829 (1231E64) has a built-in temperature sensor for automatic temperature compensation (ATC). The semi micro probe model 102832 (1235B66) has a 5mm-diameter probe. The calomel reference model 102833 (1235B67) is for use with Tris buffers and for testing solutions containing proteins, organic compounds, or heavy metals that could react with the silver wire found in most other electrodes. The spear-tip model 102834 (1235B68) has a 5mm-diameter tip for penetrating gels and semisolid materials. 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. Thomas Scientific manufactures scientific supplies and equipment such as pH meters, balances, glass and plastic ware, baths, and centrifuges for life science, research, industrial and educational applications. Founded in 1900, Thomas Scientific is headquartered in Swedesboro, NJ.