Automotive Test Light 3-48V Digital LED Voltage Tester, Car Circuit Tester with Polarity Indicator, 87" Spring Cable & Stainless Steel Probe for Car RV Truck Fuse Battery Detection

3-48V EXCLUSIVE CALIBRATION FOR VEHICLE ELECTRICAL SYSTEMS: This automotive test light is calibrated for 3-48V DC circuits, perfectly matching car, RV, truck electrical systems. Accurately diagnoses common issues: battery voltage detection, fuse faults, headlight/taillight circuit malfunctions, meeting all daily diagnostic needs | LED DIGITAL DISPLAY & PRECISE POLARITY INDICATOR: High-brightness LED digital screen with 0.1V high resolution, clear readings day/night. Automatic bidirectional polarity indicator (red=positive, green=negative) avoids wrong operation, making circuit testing efficient and safe | 87" EXTENDABLE SPRING CABLE FOR TIGHT SPACES: Tough 87-inch spring cable with flexible stretch, easily accesses narrow under-hood areas. Wear-resistant & tangle-free design ensures stable power transmission, greatly improving testing efficiency in limited spaces | STURDY CONSTRUCTION & SAFE PRACTICAL DESIGN: Sharp stainless steel probe for easy insulation piercing and precise test contact; comes with probe protective cover for safe storage and anti-injury. Large heavy-duty alligator clip enables secure one-handed operation, non-slip grounding. High-quality ABS body, shockproof & drop-resistant for long-term use | PORTABLE ALL-IN-ONE DIAGNOSTIC TOOL FOR DIY & PROS: Compact lightweight design, fits in toolkits/car glove compartments for on-the-go repairs. This all-in-one circuit tester integrates voltage measurement, polarity detection, fuse testingno extra accessories needed, high cost-performance for DIY enthusiasts and professional automotive technicians