Fast, Accurate Electrical Troubleshooting for Cars, Trucks, and Fleets
Stop guessing when tracking down electrical faults. The 5-120V Digital Electrical Diagnostic Probe Test Pen gives you precise, real-time voltage readings to identify blown fuses, dead circuits, bad grounds, and alternator issues in seconds. Whether you’re working on a 12V passenger car, a 24V commercial truck, or a 48V–120V EV/solar setup, this tool delivers professional-grade accuracy in a compact design.
Key Features & Benefits
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Expanded 5-120V DC Range: Handles low-voltage automotive systems up to high-voltage equipment, making it versatile for cars, SUVs, motorcycles, RVs, trailers, and boats.
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Backlit Digital LED Display: Shows live voltage readouts down to 0.1V resolution. The bright screen is easy to read under direct sunlight or inside dark engine bays.
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Dual-Color Polarity Indicator: Built-in LED lights instantly show positive (red) and negative (green) polarity, preventing hookup mistakes and speeding up continuity checks.
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Insulation-Piercing Probe: Sharp stainless steel tip glides through wire insulation to make solid contact without stripping or damaging the wire.
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Extended Coiled Spring Cord: Flexible, anti-tangle wire stretches up to 96+ inches, giving you plenty of reach across engine compartments or under the dash.
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Heavy-Duty Alligator Clip & Protection: Large insulated ground clip allows easy one-handed operation. Includes a protective sleeve cap to keep the probe sharp and safe in your toolbox.
Common Applications
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Testing car battery capacity and alternator charging output
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Locating blown fuses, faulty relays, and broken wiring harnesses
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Checking taillight, headlight, and trailer hitch wiring circuits
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Verifying proper ground connections and switch operations
Product Specifications
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Voltage Range: 5V – 120V DC
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Display Type: Backlit Digital LED
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Probe Material: Heavy-duty Stainless Steel
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Lead Cable: High-flexibility coiled spring wire with heavy-duty ground clip
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