A versatile electrical system test tool designed for 12V wiring and automotive applications. The extendable spring cable provides flexible reach for testing in tight spaces, making it easy to test any electrical system, including automotive circuits. Key features - Extendable spring cable: long enough for diverse testing tasks, suitable for automotive test light use. - 12V probe tester with copper tips: easily pierce wire insulation to check circuits and wiring in cars; includes a test light with voltage display. - Uninterrupted voltage display: real-time updates for convenient and reliable voltage readings. - Beginner-friendly circuit tester: simple to start and test voltage, improving workflow with a handy lead test light. 2-3 practical use scenarios - Automotive diagnostics: test fuses, ignition circuits, headlights, and other 12V wiring to locate faults quickly. - Wiring installation and checks: verify 12V supply and ground continuity during new installs or repairs on cars, motorcycles, boats, or trailers. - DIY electronics and maintenance: monitor live circuits while wiring projects or troubleshooting electrical components. Designed for clear, trustworthy performance, this tool emphasizes function, compatibility with 12V systems, compact handling, and real-time voltage feedback to support accurate electrical testing.