Fluke BK120 is a breaker finder and voltage detector combo. It comes with a transmitter and receiver, includes built-in GFCI testing, and offers non-contact voltage (NCV) detection for added safety.
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Klein ET310 is a digital circuit breaker finder with a GFCI outlet tester. It also uses a transmitter and receiver system, designed mainly for residential and light commercial use, with wiring condition indicators and compact storage.
Key Spec & Feature Comparison
| Spec / Feature | Fluke BK120 | Klein ET310 |
|---|---|---|
| Safety Rating | CAT III 150 V | CAT II 120 V |
| Operating Voltage | 110-125 VAC | 90-120 VAC |
| NCV Mode | Yes, dual sensitivity | No |
| GFCI Testing | Yes | Yes |
| Size & Portability | Compact, lightweight | Receiver + dockable transmitter |
| 💳 Pricing | 💲Check Price | 💲Check Price |
| Alerts / Feedback | Audible and visual, flashlight, auto sleep | Audible and visual, wiring condition LEDs |
| Battery Type | Receiver uses 2 AAA; transmitter line-powered | Receiver uses 1× 9V; transmitter line-powered |
Where One Excels Over the Other
The Fluke BK120 stands out with NCV detection, flashlight, and a higher safety rating, making it better for users who need extra safety checks and advanced features.
The Klein ET310 is simpler, easier to store, and budget-friendly. It’s reliable for finding breakers and testing GFCI outlets without the added complexity of NCV.
Trade-Offs to Consider
- The BK120 includes more features but costs more and may drain batteries faster.
- The ET310 lacks NCV but is straightforward and affordable.
- Both units draw power from the circuit through their transmitters, but the receivers use different batteries (AAA vs 9V).
- BK120 is designed for slightly higher safety margins, while the ET310 is sufficient for basic household circuits.
Verdict: Which Should You Choose?
Choose the Fluke BK120 if you:
- Want built-in NCV detection for added safety
- Need a higher safety rating for confidence in tougher environments
- Appreciate extras like a flashlight and dual-sensitivity detection
Choose the Klein ET310 if you:
- Primarily need to identify breakers and test GFCI outlets
- Don’t need NCV detection
- Want a simple, dependable, and cost-effective tool
Bottom Line
Both the Fluke BK120 and Klein ET310 are excellent breaker finders. The BK120 is ideal for professionals or safety-conscious users who value extra features, while the ET310 is a solid, straightforward option for those who just need a reliable tool for everyday breaker identification.