Highly visible LEDs provide clear vision in low light, making it easy to check electric testers and circuit testers. Bright LED indicators ensure accurate readings in dim conditions, supporting trailer light testing and quick checks with the electric test pen. Sensitive detection accurately identifies electrical currents, delivering reliable test results for circuit testers and circuit test pens. Versatile for professional electricians and vehicle maintenance, functioning as a test pen, voltage tester, and circuit tester. Use scenarios: - Automotive and trailer lighting checks: test wiring, trailer plugs, and indicator lights with the test pen and voltage tester. - Workshop electrical maintenance: verify circuit status, panel wiring, and continuity using the circuit tester. - Field service and vehicle maintenance: perform quick voltage presence checks before starting work.