Diverse applications: Suitable for HVAC, electrical work, and industrial testing; useful for professionals and home users 4 mm banana compatibility: Compatible with standard 4 mm banana connectors, enabling easy integration with a wide range of multimeters and leads Replaceable needles: Features replaceable needles for longlasting performance and reduced maintenance costs Electrical test hook for vehicles: The test hook securely grips wires up to 4 mm, supporting safe vehicle diagnostics Use scenarios Vehicle diagnostics: Attach to wires up to 4 mm to test circuits in automotive wiring harnesses and connectors during routine maintenance or troubleshooting HVAC and electrical system service: Probe sensors and connections in control panels and equipment for diagnostics and verification Industrial equipment testing: Verify continuity, connections, and sensor wiring in motors, relays, and power circuits in industrial environments