Hanna Instruments HI1220 EC/TDS Probe with DIN Connector, 240mm Length

The Hanna Instruments HI 1220 is an electro-conductivity (EC) and total dissolved solids (TDS) probe with Automatic Temperature Compensation (ATC), measures 24cm (9.4'), can be used to mix fertilizer solutions, is for use with the HI 981409 TDS tester and the HI 981410 EC tester, and has a Deutsches Institut für Normung (DIN) connector. A TDS electrode measures conductivity of a solution containing substances such as salts and minerals. TDS electrodes are commonly used by researchers, manufacturers, and hobbyists in aquaculture, agriculture, hydroponics, and water testing, and for scientific applications. This electrode provides ATC with an internal thermometer sensor for accurate readings in fluctuating temperatures. The electrode measures 24cm (9.4') and can be used to mix fertilizer solutions. The electrode has a DIN connector for tight connections with the HI 981409 TDS tester and the HI 981410 EC tester.

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), and ion selective electrode (ISE). Electrodes can be half-cell or full-cell (also called combination) types. 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. 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.

Hanna Instruments manufactures analytical instrumentation and supplies, including pH meters, electrodes, chemical reagents, and buffer solutions. The company, founded in 1978 and headquartered in Woonsocket, RI, meets International Organization for Standardization (ISO) standard 9001.