1ORP Electrode: It is harmless to the human body and has good conductivity, and widely used in the test of aqueous solutions. 2Wide Use: For most ORP meters and controllers with BNC Q9 connectors, used in water source systems such as aquariums, hydroponics, swimming pools. 3PH Test: Measure the pH value in the aqueous solution for accurate up and down adjustment, which needs to be used in conjunction with the meter. 4Strong Conductivity: The ORP replacement probe is made of sturdy and durable materials, has good conductivity, and is environmentally friendly. 5ORP Probe: Different water quality ORP ion oxidation degree is always can help remove harmful substances in the water you use to.Item Type: ORP Replacement ProbeMaterial: PlasticElectrode Length: Approx. 155mm / 6.1in (Delivered with liquid)Probe Type: Sensitive Crystal Ball BubbleRange: 0~1999mVAccuracy: 5mVApplicable Temperature Range: 5~70Electrode Potential: 245-270mv (15~30)Internal Resistance of Reference Electrode: 10kElectrode Stability: 8mv/24Electrode Indicator Electrode: Good ConductivityElectrode Plug Type: Q9PH Electrode Wire Length: Approx. 1.2m / 3.93ftGross Weight: Approx. 89g / 3.14ozCan be widely used in water source systems such as aquariums, hydroponics, hot springs, swimming pools, etc.1 x Electrode