Test Leads & Probes

Test leads and probes are essential accessories for electrical measurement instruments including multimeters, insulation testers, and high-voltage test equipment. These safety-critical components provide the physical connection between the instrument and the circuit or component under test, directly determining both measurement accuracy and operator safety. They must be selected to match the instrument's input rating, the voltage category of the environment, and the physical requirements of the connection point.

Available in a wide range of voltage ratings, tip styles, and lengths, test leads are specified by their measurement category (CAT II, CAT III, CAT IV) and maximum voltage rating. High-voltage screened leads — such as those used with insulation resistance testers and cable fault locators — feature shielded construction to prevent interference and reduce the risk of arc flash at elevated potentials.

Typical Applications

Insulation resistance testing on motors, cables, and transformers using high-voltage rated screened leads
Continuity and resistance measurements in electrical panel maintenance and commissioning
High-voltage cable testing and fault location with shielded clip leads rated to 15 kV and above
General-purpose bench testing and field service using standard multimeter probes
Safety compliance testing in industrial environments requiring CAT-rated accessories

Popular Brands

Megger is the leading supplier of high-voltage test leads and screened clip lead sets for insulation and cable testing, including sets rated to 15 kV. Fluke offers a comprehensive range of safety-rated test leads for general electrical measurement. Keysight and Pomona manufacture precision test leads for laboratory and parametric measurement applications.