This automotive circuit fault tester is designed for precise electrical diagnostics in passenger cars, SUVs, and commercial vehicles. As a high-precision automotive circuit probe tester, it measures current up to 20 amperes on 48-volt systems, helping identify fuse failures, wiring issues, relay faults, and abnormal power draw. Used as an automotive circuit tester or fuse circuit tester automotive, it detects subtle current changes that indicate hidden circuit problems. The built-in front light illuminates dark engine compartments, allowing safe operation during nighttime inspections or roadside diagnostics. The blue backlit LCD screen provides clear, real-time readings in both bright and low-light environments, ensuring reliable results during every test. Constructed from durable ABS/PC material with a non-slip rubber-coated grip, this automotive circuit fault probe tester offers comfortable handling for extended use. Powered by a long-lasting 23A battery, this tool supports multiple testing sessions without frequent battery changes. Whether used as a circuit tester automotive tool or a general power circuit tester for automotive systems, it delivers dependable performance for technicians and automotive DIY users.