ORP Replacement Probe Aquarium Hydroponic Laboratory Electrode Oxidation-Reduction Potential Test BNC Q9 Connector The combined electrode is composed of platinumneedle indicating electrode and silver-chlorinated silver reference electrode. It is the measuring elements of ORP meter and water quality tester, using to measure the ORP of aqueous solution/water. Features: Widely used to test the the ORP of aqueous solution/water. Perfect laboratory ORP electrode probe. Suitable for most ORP meter and controller with BNC Q9 connector. Filled with saturated kcl colloidal solution, used for printing circuit board, ORP on line measurement of containing chromium wastewater treatments. Made of fine quality material with no harm to humanbody and fine conductivity. Mainly used to measure water quality, suitable for swimming pools and spas, koi fish ponds, but also for water sources, aquariums, hydroponics, laboratories, seawater, marine/saltwater fish tanks and other water systems. Specifications: Material: PC Range: 0-1999mV Accuracy: ±5mV Applicable temperature range: 5-70℃ Electrode potential: 245-270mv (15-30℃) Internal resistance of the reference electrode: ≤10kΩ Electrode stability: ±8mv/24 Type of electrode plug: Q9 Length of PH electrode line: approx. 0.7m / 27.5in Item size: 155 * 20 * 20mm / 6.1 * 0.8 * 0.8in Item weight: 50g / 1.8ounce Package size: 180 * 45 * 23mm / 7.1 * 1.8 * 0.9in Package weight: 75g / 2.6ounce Packing List: 1 * ORP Electrode