Klein Tools ET270 Auto-Ranging Digital Multi-Tester - Reliable GFCI

In this review of the Klein Tools ET270, the bottom line is simple: this compact multimeter is for electricians, contractors and serious DIYers who need a single, practical tool that combines general multimeter measurements with built-in receptacle and GFCI testing. The ET270 shines because it pairs auto-ranging AC/DC voltage and resistance measurements with a dedicated receptacle test cord and GFCI trip time readout, making troubleshooting and safety verification faster on the job or at home.

Key Features

• AC/DC Voltage to 600V: Measures line and device voltages up to 600V so users can verify power presence and diagnose faults safely.
• Resistance to 40MOhms: High resistance range lets users check wiring continuity and component resistance for accurate diagnostics.
• GFCI Receptacle Test: The receptacle test mode detects common wiring faults and displays GFCI trip time for reliable safety checks.
• Battery Test and Find Mode: Built-in battery checks for 9V and 1.5V cells and a find mode that helps identify the correct circuit breaker to a receptacle.
• Backlit LCD and Hands-Free Options: A backlit display improves visibility in dim conditions while the kickstand, test lead holders and optional magnetic hanger aid hands-free operation.
• Complete Kit: Includes test leads with safety caps, receptacle test cord, carrying case and batteries so it is ready to work out of the box.

Who It's For

The ET270 is aimed at professional electricians and informed DIYers who need a reliable, all-in-one tester for both general electrical measurements and specific receptacle/GFCI checks. Its receptacle test cord and trip time display make it particularly useful for service technicians verifying GFCI protection and troubleshooting outlet wiring faults.

Less experienced hobbyists who only need occasional basic measurements might find the feature set broader than necessary, and those requiring advanced bench instrumentation or extremely high-precision lab measurements should look to higher-end meters tailored for those use cases.

Pros & Cons

Pros

• Versatile measurement set including AC/DC voltage, resistance and continuity covers most field tasks.
• Dedicated receptacle/GFCI test mode with trip time display simplifies safety verification.
• Sturdy build and clear backlit LCD make it easy to use on job sites and in low light.

Cons

• Not intended as a replacement for high-end bench multimeters when extreme precision or advanced features are required.

Specifications

Our Verdict

The Klein Tools ET270 is a practical, well-built multimeter for tradespeople who need both general measurement capability and dedicated receptacle/GFCI testing in one compact kit. It delivers strong value with useful hands-free options and readable backlit output, making it a smart buy for electricians and advanced DIY users who want a dependable field instrument without paying for lab-grade extras.

Frequently Asked Questions

Can the ET270 test GFCI trip time?
Yes. The meter includes a receptacle test mode and an LCD trip time readout to measure how long a GFCI takes to trip.

Does it come with test leads and batteries?
Yes. The ET270 ships with right-angle test leads with safety caps, a receptacle test cord, a carrying case and 2 x AAA batteries.

Is it suitable for automotive and household work?
Yes. With AC/DC voltage up to 600V and resistance/continuity functions, it is well suited for household and many automotive electrical checks.