The combined electrode consists of a needle indicating electrode and a silver-chloride reference electrode. It serves as a measuring element for ORP meters and water quality testers, used to measure the ORP of solutions or water. Suitable for use in water sources, aquariums, hydroponics, laboratories, spas, swimming pools, and other water systems. Features: Widely used for testing ORP in solutions or water. High-quality laboratory ORP electrode probe. Compatible with most ORP meters and controllers equipped with a BNC Q9 connector. Filled with saturated solution, suitable for printed circuit board applications and online ORP measurement in chromium-containing wastewater treatment. Made from environmentally friendly material that is safe for human contact and offers excellent conductivity. Specifications: Type: ORP-101 Electrode Type: Laboratory Electrode Probe Type: Sensitive Crystal Ball Range: 0 to 1999 mV Accuracy: ±5 mV Temperature Range: 5 to 70°C Electrode Potential: 245–270 mV (at 15–30°C) Reference Electrode Internal Resistance: ≤10 kΩ Electrode Stability: ≤8 mV/24h Indicator Electrode Conductivity: High Electrode Plug Type: Q9 BNC Orientation: Upright Cable Length: 70 cm (27.5 inches) Item Dimensions: 155 x 20 x 20 mm (6.1 x 0.8 x 0.8 inches) Color: As shown in image Material: Plastic Package Contents: 1 x ORP Electrode Probe Note: The package includes only the items listed above. Other items are not included. Note: Lighting and display differences may cause slight color variations between the image and the actual item. Measurement error is ±1–3 cm.