1. The CT-3S Polarization Testing Probe is a long-lasting, high-stable, IR drop elimination cathodic protection potential measurement probe for buried steel pipelines, primarily used for detecting and monitoring cathodic protection potentials in corrosion control projects for buried and underwater steel pipelines. Its unique structure eliminates about 90% of the IR drop in soil mediums; when used with the ZSC-2 Potential Measurement Instrument, it can virtually eliminate the IR drop in soil mediums, ensuring more accurate and reliable protection potential detection and monitoring results. The built-in reference electrode of this probe is either a copper/saturated copper sulfate electrode or a zinc electrode. This product was developed in accordance with NACE TM0494 "Cathodic Protection Criteria for Buried and Groundwater Metal Pipelines Test Methods Standard" and meets 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