Wide application: Designed for HVAC, electrical, and industrial testing, this multimeter needle probe is a versatile tool that supports professionals across multiple fields. 4mm banana compatibility: Standard 4mm banana plug compatibility ensures the probe works with a broad range of multimeters and test leads, providing flexibility and convenience during use. Replaceable needle probe: Replaceable needles offer a costeffective solution, extend the tool's life, and simplify maintenance for ongoing projects. Vehicle testing hook: The multimeter test hook securely grips wires up to 4mm, enabling safe and efficient electrical diagnostics in automotive applications. Practical use scenarios: 1) HVAC service: Use the needle probe to check voltages and continuity in controls, sensors, and relays without removing connectors. 2) Electrical panel troubleshooting: Connect to a multimeter with 4mm banana compatibility to verify circuit continuity and resistance in distribution panels. 3) Automotive wiring diagnostics: Employ the test hook to probe vehicle harnesses and connectors, diagnosing faults while keeping wiring stable and accessible.