4MM COMPATIBILITY: Each probe features a standard 4mm banana plug that works with numerous multimeters and test leads for convenient testing. EASY MAINTENANCE WITH REPLACEABLE NEEDLES: Replaceable needles provide an economical solution and extend the life of your tools. SAFE VEHICLE DIAGNOSTICS HOOK: Designed to grip wires up to 4mm securely, the vehicle test hook ensures safe and efficient electrical testing during diagnostics. Use case: Automotive diagnostics Use the 4mm banana compatibility and secure 4mm grip to probe vehicle wiring connections during diagnostics, reducing the risk of slippage and improving testing accuracy. Use case: General electronics testing Pair with common multimeters and test leads for reliable measurements and easy instrument interchangeability during circuit troubleshooting. Use case: Lab bench wiring and prototyping Securely hold and test wires within the 4mm range on a workbench, supporting repeatable tests and safe handling during experiments.