NOYAFA NF-824 Circuit Breaker Finder with LCD, GFCI Testing and NCV

For electricians, home-maintenance workers and DIYers tracing circuits, the NOYAFA NF-824 combines a circuit breaker finder with a GFCI outlet tester and non-contact voltage detection.

Its transmitter sends a signal from an outlet or fixture while the receiver scans the breaker panel. The LCD shows voltage and signal strength, giving you visual feedback as you locate the matching breaker.

A backlit screen, audible alerts and adjustable sensitivity help make circuit tracing more manageable across different work areas. The built-in flashlight is useful when the panel or outlet is in a dim spot.

Pros

The NF-824 is designed to identify breakers in energized electrical systems, with stated support for 90–230V AC systems and compatibility with standard breaker systems, GFCI outlets and 230V electrical systems. For standard circuit breaker systems, the stated range is 90–120V AC at 50/60Hz.

As you scan the panel, the receiver beeps when it approaches the matching breaker. Its seven sensitivity levels let you adjust the signal response during the search, while the LCD displays signal strength and voltage. Red and green indicator lights add another visual cue, making it easier to follow the test status rather than relying on sound alone.

The tester also supports GFCI testing and can help identify six common wiring faults, including an open circuit and reverse polarity. For a practical home-maintenance task, you can connect the transmitter at an outlet, scan the panel with the receiver, then use the displayed signal and alerts to identify the corresponding switch.

The essentials

This is a circuit-tracing kit for locating a breaker and checking outlets or fixtures. The transmitter connects at the outlet or fixture, and the receiver is used at the panel. Non-contact voltage detection (NCV) adds a way to detect AC voltage without direct contact, while the GFCI test function gives the tool another role when checking GFCI outlets.

The rechargeable design uses a built-in 390mAh, 3.7V lithium battery and charges through USB-C. Both transmitter and receiver have auto power-off and low-battery indicators. The kit also includes a three-prong-to-two-prong adapter, a light-socket adapter, an alligator-clip adapter and a carrying case to keep the equipment together between jobs.

Practical tips

Connect the transmitter to the outlet or fixture you want to trace, then scan the panel with the receiver and follow the signal-strength display and audible alerts. If the signal needs adjustment during the search, use the receiver’s sensitivity settings. The flashlight can help illuminate a work area, and USB-C charging supports recharging between tasks. Low-battery indicators and auto power-off are useful prompts and convenience features during routine use.

Before you decide

How does the NF-824 locate a breaker? Connect the transmitter to an outlet or fixture, then scan the breaker panel with the receiver. The receiver beeps as it approaches the matching breaker, while the LCD shows signal strength.

Can it test GFCI outlets? Yes. The NF-824 includes a GFCI safety test function, alongside its circuit-tracing and NCV features.

What comes in the kit? The kit includes the NF-824 circuit breaker finder, a three-prong-to-two-prong adapter, a light-socket adapter, an alligator-clip adapter and a carrying case.

Buying verdict

Choose the NOYAFA NF-824 when your work calls for one tool to trace breakers, test GFCI outlets and detect AC voltage without contact. Its LCD feedback, adjustable sensitivity, rechargeable design and included adapters make it a practical fit for electrical troubleshooting at home or on the job.