The HT86A Automotive Test Light is a heavy-duty, professional-grade tool designed for comprehensive automotive electrical system diagnostics, operating efficiently within a wide voltage of 2‑100V DC. This digital LED circuit tester combines advanced functionality with user-friendly features, making it an essential instrument for mechanics, DIY enthusiasts, and automotive technicians. Equipped with a bidirectional voltage testing capability, it accurately detects both positive and negative voltage polarities, ensuring precise readings when troubleshooting circuits, fuses, batteries, alternators, and electrical components in cars, trucks, motorcycles, boats, and DC-powered vehicles. The integrated digital display provides clear, real- voltage measurements, eliminating guesswork and enhancing diagnostic accuracy, while the bright LED indicator offers visual confirmation of circuit continuity and voltage presence, even in low-light environments. Constructed with heavy-duty materials, including a durable insulated and a sturdy, ergonomic handle, the tester is built to withstand the rigors of daily use in garage or workshop settings, ensuring long-lasting reliability. Its compact and portable design allows for easy maneuverability in tight spaces under the hood or dashboard, making it suitable for both professional and home automotive maintenance tasks. Whether checking for faulty wiring, verifying power supply, or diagnosing electrical issues, the HT86A Digital LED Circuit Tester delivers consistent performance, safety, and convenience, making it a valuable addition to any automotive tool kit.