1, PRECISION WORKING: The ORP BNC tester is made of high quality material with long service life. 2, EASY TO INSTALL AND USE: The BNC tester is easy to install and use, can be used with ORP connector. 3,Replaceable ORP electrode with 50 ohm BNC socket and protective cap 4,Best tool for general water applications such as drinking water, domestic water, rainwater, aquariums, tanks, ponds, swimming pools, spas and more. Widely used for testing solution/water ORP. Excellent laboratory ORP electrode probe. Fits most ORP meters and controllers with BNC Q9 connector. Fill with saturated solution for in-line ORP measurement on printed circuit boards, chromium-containing wastewater treatment. Environmentally friendly materials, harmless to humans, highly conductive. Primarily used to measure water quality for swimming pools and spas, fish ponds, but also for water sources, aquariums, hydroponics, laboratories, seawater, seawater/marine fish tanks and other water systems. Probe Type Probe Range: 0 - ±1999mV Accuracy: ±5mV Applicable Temperature Range: 5 - 70°C Electrode Potential: 245-270mv (15-30°C) Reference Electrode Internal Resistance: less than or equal to 10kΩ Electrode Stability: ±8mv/24 Electrode Plug Type: Q9 BNC: Upright pH Electrode Cable Length:. 300cm