Accurate Voltage Reading: The Car Test Pen Circuit Tester accurately measures DC voltage levels in your car or truck, helping you diagnose electrical issues quickly and easily. Long Probe Design: With a long probe design, this tester can reach even the most hard-to-reach areas of your vehicle's electrical system, making it a must-have tool for any serious mechanic or DIY enthusiast. Digital Display: The digital display on this tester makes it easy to read voltage levels, even in low-light conditions. Plus, the display is backlit for added convenience. Built-In Light: The built-in light on this tester makes it easy to see what you're working on, even in dark areas of your vehicle. This feature is especially useful for nighttime repairs or inspections. Durable Construction: Made from high-quality materials, this tester is built to last and can withstand even the toughest working conditions.Car Test Pen Circuit Tester, DC Truck Voltage Digital Display Long Probe Pen With Light, Automotive Diagnostic Tools Auto Repair Tool