All-in-One Circuit Diagnosis: Combines Circuit Breaker Finder, Outlet Tester GFCI Tester Quickly locate breakers, test outlets, and verify GFCI protection in one compact tool. Perfect for troubleshooting home wiring or commercial systems Precision Voltage Signal Strength Display: Dual-Function LCD Screen Displays Real-Time Voltage (90-135V) and Signal Strength for precise circuit tracing. Unlike basic testers, our circuit breaker finder tool eliminates guesswork by showing exact data, ideal for electricians and DIYers tackling complex panels LED indicator light and large screen: The GFCI Tester has an automatic trip testing function, which is different from general testers. Our tool can accurately display the time taken for tripping. The clear visual feedback of the red/green indicator lights combined with the details displayed on the large screen can accurately diagnose 6 common wiring faults, including open circuit/reverse polarity Durable and portable, with high on-site efficiency: This Breaker Finder discoverer features an impact resistant ABS housing and a lightweight design (0.9 pounds) - capable of withstanding the requirements of the work site, compact in shape, sturdy and durable, suitable for repairing and troubleshooting household or commercial circuit faults. Includes a suitcase for easy storage and transportation Complete Ready-to-Use Package Includes: 1x Transmitter (IEC61010-1 Screw-Sealed Battery Compartment)?1x Receiver ?with anti slip design??2x AA + 2x AAA Batteries?1x Screwdriver?1x Manual?1x Carrying Case?Certified CAT II 135V Safety Rating with ETL Compliance Ensure zone safety in residential/commercial wiring diagnosis