The combined electrode is composed of platinum 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 aqueous solution/water.Apply in water sources, aquarium, hydroponics, laboratory, spas, swimming pools and other water systems.Features: Widely used to test the the ORP of aqueous solution/water.Great 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 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/24Indicator Electrode of Electrode: Good ConductionType of Electrode Plug: Q9BNC: UprightLength of pH Electrode Line: Approx. 70cm / 27.5inItem Size: Approx. 155 x 20 x 20mm / 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.