1. The CT-3S Polarization Testing Probe is a long-lasting, high-stable, IR drop compensation cathodic protection potential measuring probe for buried steel pipelines, primarily used for the detection and monitoring of cathodic protection potentials in corrosion control projects for buried and underwater steel pipelines. Its unique structure can eliminate about 90% of the IR drop in soil media; when used in conjunction with the ZSC-2 Potentiostatic Measurement Instrument, it can nearly eliminate the IR drop in the soil media, ensuring more accurate and reliable protection potential detection and monitoring results. The built-in reference electrode of this probe is a copper/saturated copper sulfate electrode or a zinc electrode. This product is developed in accordance with NACE TM0494 "Standard Test Methods for Cathodic Protection of Buried and Underground Metal Pipelines," meeting the requirements of the latest domestic and international technical standards. 2. Specifications and Standards -- 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