2. Standards and Specifications -- GB/T2423.1 Environmental Tests for Electrical and Electronic Products, Part 2: Test Methods, Test A: Low Temperature Test -- GB/T2423.2 Environmental Tests for Electrical and Electronic Products, Part 2: Test Methods, Test B: High Temperature Test -- GB/T2423.3 Environmental Tests for Electrical and Electronic Products, Part 2: Test Methods, Test C: Constant Humidity and Temperature Test -- GB/T21246 Method for Measuring Cathodic Protection Parameters of Buried Steel Pipe -- NACE TM0494 Cathodic Protection Criteria for Buried and Submerged Metal Pipes Test Methods Standard 3. Main Technical Performance 3.1 Stable Potentiometer: Copper/Saturated Copper Sulfate Electrode, 70±5mV (relative to CES Electrode). 3.2 Dimensions: φ75×280mm. 3.3 Internal Resistance: <1MΩ. 3.4 Service Life: >10 years. 3.5 IR Drop Elimination: Can eliminate about 90% of IR drop, works best with the ZDC-2 Potential Difference Measurement Instrument.