Needle performance: The needle is stainless steel with precision manufacturing. It resists weakly corrosive media such as air, steam and water, is rustresistant, and offers strong heat resistance. Use range: Designed for universal meters and electrical testing in the laboratory, including experiments, test boards, prototyping, and troubleshooting. Suitable for use in laboratories, shops, schools, homes and industries. performance: Lightweight and chemically stable; will not rust. Good impact resistance, wear resistance and transparency; provides good insulation and has low thermal conductivity. Delivers a long service life. Advantage: Nonslip and sturdy with a firm connection and stable performance. Color coded in black and red for easy identification and use, convenient for classroom or laboratory experiments. Use scenarios: In university electronics labs for meter setup, calibration and circuit prototyping. In workshops for quick electrical testing, troubleshooting and prototyping on test boards. In classrooms and schools for teaching demonstrations, using colorcoded leads to distinguish circuits and facilitate learning.