- Built-in circuit board and line protection: This premium car fuse tester uses a built-in circuit board chip with line protection function, offering more features than traditional test lights. It is equipped with an insulation protective cover for better grip and insulation protection. - Clear digital display and readouts: The tester features a highly clear LED backlit display for voltage readings, with 0.1V resolution and ±0.2V accuracy, providing clearly visible readouts. It remains easy to read in daylight or dark environments, independent of ambient brightness. - Bidirectional polarity indicator: A bidirectional LED on the circuit board indicates polarity (red for positive, green for negative). The alligator clamp can be attached to either negative or positive ground while using the probe to touch the opposite side. - Extended spring wire with alligator clip: Extends up to 110 inches, with a long flexible spring wire for a wide testing area. The anti-bending tail design reduces contact issues, and a large size alligator clip enables easy one-hand operation. - Use scenarios: - Diagnose automotive fuses and circuits in cars, trucks, or SUVs to verify power and ground conditions. - Verify battery connections and polarity during installation, repair, or maintenance. - Test wiring circuits for polarity and continuity in motorcycles, ATVs, or other vehicles.