Kelvin Fish Clamp Test Lead Wear-resistant construction with easy plug and unplug operation for quick setup and reliable reusability. Four-wire method (Kelvin measurement): Also known as four-terminal measurement technology, this impedance measurement method in electronic circuits is primarily used for accurate measurement of resistor resistance. Wiring resistance impact: The voltage difference generated by wiring resistance is almost zero and does not affect voltage measurement results. Contact resistance: Since only a very small portion of the current flows through the voltmeter, it does not affect the current measurement results. Function and performance: Enables accurate resistance measurements by eliminating lead and contact resistance errors, providing stable and dependable results in precision applications. Compatibility: Suitable for four-terminal measurement setups and common measurement instruments, facilitating integration into existing test rigs. Use scenarios: 1) Calibrating precision resistors in a laboratory to verify tight tolerance values. 2) Testing shunt resistors in power supplies or motor drives where accurate current sensing is required. 3) Performing in-circuit impedance checks on RC networks during circuit debugging and development.