Extendable spring cable for flexible reach: test any electrical system with ease and convenience, and the setup includes an automotive test light for onvehicle diagnostics. 12V probe tester with copper probes: probes easily pierce wire insulation to check circuits, making it useful for car wiring inspection and circuit verification; the test light provides a voltage display for quick assessment. Realtime 12V voltage display: uninterrupted, realtime voltage updates for easy monitoring and accurate readings during electrical testing. Beginnerfriendly circuit tester: designed for users with varying levels of experience, offering straightforward operation to test voltage and diagnose circuits; includes a lead test light for practical use. Use scenarios Automotive diagnostics: inspect car wiring harnesses, fuses, lighting circuits, and sensors to identify power and ground issues quickly and accurately. 12V systems on boats, RVs, ATVs, and motorcycles: verify battery voltage, test accessory circuits, and troubleshoot wiring in 12V networks. DIY electrical projects: verify voltage supply before wiring, check circuit continuity, and troubleshoot 12V projects with a reliable, easytouse tester.