The Klein Tools ET310 AC Circuit Breaker Finder is a must-have for efficient electrical troubleshooting, offering precise circuit breaker identification with both visual and audible indicators. This two-part system includes a transmitter with a built-in GFCI outlet tester and a receiver for easy and accurate detection, all conveniently stored together. Designed for 90-120V AC circuits and North-American-style outlets, it ensures broad compatibility and added safety for any installation. Trust Klein Tools for reliable performance and make every electrical job quicker and safer.
Table of Contents
Disclosure: As an Amazon Associate, I earn from qualifying purchases. This means when you purchase through links on this page, I may earn a small commission at no extra cost to you.
Klein Tools ET310 – Complete Review 2026
When it comes to electrical troubleshooting, the Klein Tools ET310 Circuit Breaker Finder stands out as a top choice for professionals in 2026. Identifying the right breaker can be a nightmare in a crowded panel, but this device is engineered to simplify the process of breaker identification, panel scanning, and home wiring safety. Whether you’re a seasoned electrician or a DIY enthusiast, the Klein Tools ET310 delivers a blend of accuracy and user-friendly operation.
Quick Verdict: The Klein Tools ET310 is a must-have for efficient electrical troubleshooting, offering precise circuit breaker identification with both visual and audible indicators. Its integrated GFCI tester makes it a 2-in-1 powerhouse for home safety.
Klein Tools ET310 Key Specifications
Before diving into the details, let’s look at the technical side of this circuit tester:
| Feature | Specification |
| Voltage Range | 90-120V AC |
| System | Two-part (Transmitter & Receiver) |
| Safety Features | Integrated GFCI Testing |
| Weight | 7.2 oz (Lightweight & Portable) |
| Indicators | Visual (LED) & Audible (Beep) |
Top Pros & Cons
Pros:
- Highly Accurate: Swiftly identifies the correct breaker without false positives.
- Dual Functionality: Built-in GFCI outlet tester for comprehensive safety checks.
- Smart Design: The transmitter docks into the receiver for easy storage.
- User-Friendly: Visual and audible cues are ideal for loud environments.
Cons:
- Voltage Limits: Designed strictly for 90-120V AC North American outlets.
- Build Quality: Some users feel the plastic housing could be more rugged.
1. Precise Breaker Identification Technology
The Klein Tools ET310 Circuit Breaker Finder employs advanced digital technology to swiftly and accurately find the correct breaker. This feature reduces time spent on electrical troubleshooting while preventing accidental disruptions to sensitive electronics in your home.
2. The Two-Part Transmitter & Receiver System
This unit uses a separate transmitter and receiver system. You simply plug the transmitter into the outlet you want to trace, and the receiver scans the panel. During our Real-World Performance Testing, the receiver picked up the matching breaker within 10 seconds.
3. Integrated GFCI Outlet Tester
Safety is a priority with the built-in GFCI tester. It allows users to verify wiring conditions—such as open ground or reversed polarity—and test protective GFCI devices with a single press of a button. This makes it more than just a circuit tester; it’s a complete safety diagnostic tool.
4. How It Compares to Alternatives
In the world of electrical testers, how does the ET310 stack up?
Vs. Extech CB10: The Extech is slightly bulkier and doesn’t feature the convenient docking capability found in the Klein Tools model.
Vs. Southwire 41210S: The Southwire model offers similar identification but lacks the integrated GFCI tester.
Who Should Buy the Klein Tools ET310?
- DIY Homeowners: If you need to map your circuit panel safely and easily.
- Professional Electricians: For quick troubleshooting on residential job sites.
- Property Managers: Ideal for routine maintenance and home wiring safety checks.
Frequently Asked Questions (FAQ)
Can this device test both standard and GFCI outlets? Yes, the integrated GFCI tester means this circuit tester works on both, allowing for complete home wiring inspections.
Does the Klein Tools ET310 come with a warranty? Yes, Klein Tools covers this product with a limited lifetime warranty, providing peace of mind for frequent users.
Will it work on 240V circuits? No, this specific model is designed for 90-120V AC North American outlets only.
Final Thoughts: Is It Worth It in 2026?
After reviewing the features and performance, the Klein Tools ET310 Circuit Breaker Finder remains a compelling choice for anyone focused on home wiring safety. It seamlessly blends accuracy with versatile electrical troubleshooting.
[Check Current Price and Reviews on Amazon]
