Precision work: The ORP BNC tester is made of high-quality material and has a long service life. Easy to install and use: The BNC tester is easy to install and can be used with ORP connectors. Replaceable ORP electrode with 50 ohm BNC socket and protective cap. Ideal tool for general water applications such as drinking water, domestic water, rainwater, aquariums, tanks, ponds, pools, spas, and more. Widely used to test the ORP of water or solution. Suitable for most ORP meters and controllers with BNC Q9 connector. Filled with saturated solution, suitable for printed circuit board processing and online ORP measurement in chromium-containing wastewater treatment. Environmentally friendly material, safe for human contact, with excellent conductivity. Mainly used for water quality measurement in swimming pools, spas, fish ponds, water sources, aquariums, hydroponics, laboratories, seawater, marine/saltwater fish tanks, and other water systems. Probe Type: Probe Range: 0 to ±1999 mV Accuracy: ±5 mV Applicable Temperature Range: 5 to 70°C Electrode Potential: 245–270 mV (15–30°C) Reference Electrode Internal Resistance: ≤10 kΩ Electrode Stability: ±8 mV/24h Indicator Electrode Conductivity: Good Electrode Plug Type: Q9 BNC, upright Electrode Cable Length: 300 cm Color: As shown in picture Material: Plastic Package Contents: 1 x ORP Electrode Note: Only the items listed above are included. Light reflection and display differences may cause slight color variations between the image and the actual item. Measurement error allowance: ±1–3 cm.