The combined electrode is composed of needle indicating electrode and silver-chlorinated silver reference electrode. It is the measuring elements of ORP meter water quality tester, using to measure the ORP of solution or water.Apply in water sources, aquarium, hydroponics, laboratory, spas, swimming pools and other water systems.Features: Widely used to test the the ORP of solution or water.Great laboratory ORP electrode probe. Suitable for most ORP meter and controller with BNC Q9 connector.Filled with saturated solution, used for printing circuit board, ORP on line measurement of containing chromium wastewater treatment. Material is environmental friendly with no harm to human body and great conductivity.Specifications:Type: ORP-101Type: Laboratory ElectrodeProbe Type: Sensitive Crystal Ball BubbleRange: 0 - 1999mVAccuracy: 5mVApplicable Temperature Range: 5 - 70Electrode Potential: 245-270mv (15-30)Internal Resistance of the Reference Electrode: 10kElectrode Stability: 8mv or 24Indicator Electrode of Electrode: Good ConductionType of Electrode Plug: Q9BNC: UprightLength of pH Electrode Line: . 70cm or 27.5inItem Size: . 155 x 20 x 20mm or 6.1 x 0.8 x 0.8in (ORP Electrode)Color: As ShownMaterial: plasticPackage Contents:1 x ORP Electrode ProbeOnly the above package content, other products are not included.Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is 1-3cm.