Klein Tools 80101 Circuit Breaker Finder Kit, GFCI Outlet and Receptacle Tester

The 80101 electrical testing kit bundles three separate diagnostic instruments designed to simplify troubleshooting, outlet checks, and breaker identification. It provides a digital multimeter, a dual-range non-contact voltage pen, and a GFCI receptacle tester with circuit-tracing hardware. This combination helps homeowners and technicians tackle daily electrical diagnostics without buying individual diagnostic devices separately.

Tracing panel circuits is straightforward thanks to the dedicated circuit breaker finder system. You plug the transmitter into a standard wall outlet or fixture, then run the handheld receiver across the breaker panel to identify the matching switch. For direct outlet diagnostics, the RT250 GFCI tester features a large backlit LCD readout showing circuit voltage alongside wiring conditions, including patent-pending detection of open neutral and open ground wiring faults.

General diagnostic work is covered by the MM320 digital multimeter and the NCVT3P voltage tester. The multimeter measures up to 600V AC/DC voltage, 10A DC current, and 2MOhms resistance, while also including test modes for diodes, continuity, and batteries. For quick live-wire checks, the non-contact tester offers dual-range detection covering standard 70 to 1000 VAC or low-voltage 12 to 1000 VAC applications, and it integrates a built-in flashlight for dim work areas.

While the set covers a broad range of everyday measurement tasks, it has specific operating boundaries. The multimeter caps DC current measurement at 10A and resistance at 2MOhms, which may limit specialized industrial tasks. Additionally, the listing includes test leads for the multimeter but does not mention any included storage case or pouch to organize the three tools together.

Verdict: This three-piece diagnostic kit is an excellent, versatile choice for anyone needing to trace breakers, test GFCI outlets, and check general electrical circuits. It offers comprehensive diagnostic capability in a single package for home maintenance and routine electrical work.

• Multimeter Voltage Range: Up to 600V AC/DC
• Multimeter Current Range: Up to 10A DC
• Multimeter Resistance Range: Up to 2MOhms
• Non-Contact Voltage Ranges: 12 to 1000 VAC and 70 to 1000 VAC
• Included Tools: MM320 Digital Multimeter, NCVT3P Voltage Tester with Flashlight, RT250 GFCI Receptacle Tester and Breaker Finder

A great fit if you:

• Need to identify which breaker controls a specific wall outlet or lighting fixture.
• Want a single set containing a multimeter, non-contact detector, and outlet tester.
• Need to check for open neutral or open ground faults on GFCI circuits.
• Work with low-voltage wiring down to 12 VAC or standard household voltage up to 600V.

Consider something else if you:

• Need a multimeter that measures resistance higher than 2MOhms.
• Require AC current measurement beyond standard DC current testing.

How does the circuit breaker finder work?
The tool uses a transmitter plugged into an electrical outlet or fixture and a handheld receiver that scans the breaker panel to locate the corresponding circuit breaker.

What can the MM320 digital multimeter measure?
It measures up to 600V AC/DC voltage, 10A DC current, and up to 2MOhms resistance. It also includes functions to test batteries, diodes, and circuit continuity.

What voltage ranges does the non-contact voltage tester detect?
The NCVT3P tester features dual-range detection, operating at either 12 to 1000 VAC for low-voltage needs or 70 to 1000 VAC for standard electrical lines.

What wiring issues can the GFCI receptacle tester detect?
The RT250 tester displays circuit voltage on a backlit LCD and identifies wiring conditions, including patent-pending detection of open neutral and open ground faults.