Extech CB10 AC Circuit Breaker Finder and Receptacle Tester - Professional Grade GFCI Outlet Tester for Home & Industrial Use - Pinpoint Breakers and Fuses - Includes 9V Battery and LED Indicators

PRECISION BREAKER IDENTIFICATION: Quickly and accurately locate the correct circuit breaker or fuse without turning off power. Ideal for labeling residential or industrial electrical panels.
TWO-PASS CALIBRATION TECHNOLOGY: To ensure 100% accuracy, scan all breakers once to calibrate sensitivity, then scan a second time to pinpoint the specific circuit. (Prevents "incorrect" or "multiple" breaker signals).
INTEGRATED GFCI TESTER: The transmitter acts as a professional-grade outlet tester. It detects common wiring faults (Open Ground, Open Neutral, Reverse Polarity) and includes a dedicated GFCI trip button to test safety outlets.
SENSITIVITY ADJUSTMENT: Features a variable sensitivity dial on the receiver, allowing you to fine-tune the signal to eliminate "ghost" chirps caused by electrical noise in crowded panels.
READY OUT OF THE BOX: Includes a 9V battery and a rugged receiver/transmitter set. Pro-Tip: If the unit does not beep, ensure the 9V battery is snapped firmly into the terminal clips and the battery cover is locked.

The Extech CB10 is the ultimate time-saver for homeowners and electricians alike. This 2-in-1 diagnostic tool eliminates the frustration of flipping every switch in your breaker box just to find one specific circuit. Simply plug the transmitter into your target outlet and run the receiver over the panel. The audible and visual alerts, combined with a manual adjustable sensitivity dial, ensure you find the right breaker or fuse on the first try, even in high-density panels where automatic testers often fail. Beyond locating breakers, the CB10 acts as a comprehensive safety auditor for your home. The integrated receptacle tester features a dedicated GFCI test button and a multi-LED display that identifies correctly wired outlets and five different fault conditions: open ground, open neutral, open hot, hot/ground reverse, and hot/neutral reverse. Whether you are troubleshooting a dead outlet, installing new light fixtures, or performing a professional home inspection, the CB10 provides the reliable accuracy you need to work with confidence. The compact, ergonomic design allows the transmitter and receiver to snap together for easy storage, and the package comes complete with a 9V battery, so you can start mapping your electrical system immediately.