- Compatible with 6V/12V/24V DC automotive electronic control systems for versatile vehicle diagnostics. - Durable construction with high quality materials: AS plastic housing, carbon steel handle, and a heavy-duty acetate fiber body; designed to be tougher and more shatter-proof than typical test lights; larger and more heavy-duty than many competing lights; features a sharp stainless steel probe for piercing wires and reaching tight or hard-to-access areas. - LED digital reading for precise voltage: The Power Circuit Probe Kit provides an LED digital voltage display for accurate readings; not affected by ambient light, so it is readable in day or dark conditions; built-in LED circuit board chip offers safer and more durable performance than traditional automotive test lights. - Bidirectional polarity indication: A bidirectional voltage tester that can be clamped to negative or positive ground; the onboard LED indicates polarity with red for positive and green for negative. - Practical use scenarios: 1) Verify ECU power supply and ground in a 6V/12V/24V automotive system. 2) Inspect wiring polarity and ground conditions in hard-to-reach connectors. 3) Perform quick circuit status checks in bright sunlight or dim engine bays.