Four-in-one automotive electrical tester set - Car fuse tester: includes positive and negative alligator clips. Tests conductivity and voltage polarity in DC 6-24V systems. Useful for short-circuit tracing and car electrical problem diagnosis, helping reduce diagnosis time. - Relay tester: high sensitivity, accuracy and stable performance. Practical tool for vehicle maintenance and electrical testing; supports quick verification of relay operation. - Multimeter tester: uses an advanced high-sensitivity probe to provide accurate and quick detection of electrical signals. - Voltage meter: checks relays and the on/off state of diodes and circuits; helps solve various automotive electrical problems accurately. 2-3 use scenarios - Scenario 1: Diagnose a no-start or intermittent issue by tracing circuits with the fuse tester in a 12V car. - Scenario 2: Verify a suspected faulty relay by confirming coil activation and contact switching with the relay tester. - Scenario 3: Perform quick field checks of diode states and circuit integrity in 6-24V DC electrical systems on cars, motorcycles, or small vehicles.