Fluke BK120 SmartTrace Breaker Finder and Socket Tester

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Product guide

Fluke BK120 SmartTrace Breaker Finder and Socket Tester

Finder Socket Tester: The Fluke BK120 SmartTrace pairs a breaker-finding receiver with a transmitter that also tests outlets. It adds dual-sensitivity non-contact voltage detection, audible and visual alerts, and a flashlight, making it a combined circuit-tracing and outlet-checking tool rather than a general-purpose electrical meter.

At a glance

Two-part receiver and transmitter system is designed to identify circuit breakers at the panel.
Dual-sensitivity NCV mode is specified for supply cords and terminal strips.
Transmitter provides socket testing, including a one-button GFCI test.
LED flashlight, low-battery indicator, and auto-sleep mode are also listed.

Price

$49.99Save 38%

Reference price: ~~$79.99~~

Price checked: Nov 12, 2026

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Often bought together

Fluke 1AC II VoltAlert Non-Contact Voltage Tester, Pocket-Sized, 90-1000V AC, Audible Beeper, CAT IV Rating

$35.99

Hard Storage Case for BK120 Breaker Finder & Outlet Tester Kit（CASE ONLY） | Protective Carrying Bag, Shockproof Dustproof EVA Shell, Accessory Storage Pocket, Portable Design for Electrical Repair Use

$16.99

Pros and cons

Pros

Combines breaker identification, non-contact voltage detection, and outlet testing in one kit.
Audible and visual signals provide more than one way to follow detection and breaker identification.
The built-in flashlight can help illuminate a work area in low light.

Technical specifications

8 specifications

Identity
Brand	Fluke
Model	FLUKE-BK120

Power and battery
Power configuration	Battery Powered

Dimensions and installation
Dimensions listed	11 x 6 x 2.25 inches

Functions
Tool functions	Breaker finder, NCV detector, socket tester, and bright LED flashlight.
NCV detection	Dual-sensitivity NCV mode for non-contact voltage detection on terminal strips and supply cords.
Outlet testing	Built-in socket tester with easy-to-see LEDs to verify correct wiring in both standard and GFCI outlets.
Alerts	Audible and visual alerts

What to know before buying

The listing describes a battery-powered device but does not specify battery type or runtime. The dimensions are listed without clarifying whether they apply to the full kit or an individual component.

What’s in the box

Included

BK120 receiver
Transmitter

Who is it for?

A good fit for

Electricians and maintenance workers who want a single kit for breaker tracing and basic outlet checks.
Homeowners who need circuit identification and GFCI outlet testing in one tool.

Less suited to

Buyers seeking a general-purpose multimeter or a tool with documented measurement ranges beyond the listed functions.

Fluke BK120 SmartTrace Breaker Finder and Socket Tester · photo 2 — Additional product photo 2

Customer reviews on Amazon

4.6 / 5 · 695 ratings

5 stars83%83%
4 stars9%9%
3 stars3%3%
2 stars2%2%
1 star3%3%

Customer feedback describes the finder as easy to use and time-saving, and appreciates its non-contact voltage detection alongside breaker identification. Accuracy is a point of mixed feedback, with some customers reporting inaccurate results. Opinions on value also differ. For users who need both circuit tracing and outlet checks, the combination of receiver, transmitter, and socket-testing features is relevant, but the reported accuracy concerns matter when dependable breaker identification is a priority.

Positive themes

Customers describe it as easy to use and time-saving.
Some customers appreciate the combination of non-contact voltage detection and breaker identification.

Mixed feedback

Customer reports on accuracy are mixed, including reports of inaccurate results.
Customers disagree about whether the tool is worth its cost.

Frequently asked questions

What does the BK120 do?

The listing describes it as a breaker finder, non-contact voltage detector, socket tester, and LED flashlight. The system uses a receiver and transmitter.

Can it test GFCI outlets?

The transmitter is described as testing standard and GFCI outlets, with a one-button GFCI test function.

Does it detect voltage without contact?

Yes. The listing describes dual-sensitivity NCV detection for supply cords and terminal strips.

What do customers report about accuracy?

Feedback is mixed. Some customers report that it works well and saves time, while others describe it as inaccurate. Consider that concern if breaker identification accuracy is critical to your use.