Klein Tools ET270 Auto-Ranging Digital Multi-Tester — AC/DC 600V, GFCI Receptacle Tester

Overview

The Klein Tools ET270 Auto-Ranging Digital Multi-Tester is built for professionals and serious DIYers who want fast, reliable readings on the job or at home. With auto-ranging measurement, it covers AC and DC voltage up to 600V, and resistance up to 40 megaohms. Audible continuity helps you confirm connections, while a dedicated battery test mode verifies power sources before you rely on them. The tester also evaluates wiring conditions in standard 120V circuits and in GFCI receptacles, and it can inspect North American GFCI devices to support safe, informed decisions on-site.

Designed for real-world use, the ET270 features a clear, backlit LCD display that remains legible in low-light conditions. A compact form factor fits comfortably in a tool pouch, while thoughtful touches keep you productive: test lead holders, a built-in kickstand, and an optional magnetic hanger let you set the meter down for two-handed work.

Key capabilities at a glance

• Measures AC/DC voltage up to 600V
• Measures resistance up to 40 MΩ
• Audible continuity for quick circuit checks
• Battery test mode for 9V and 1.5V batteries
• Receptacle test mode to verify standard 120V outlets
• GFCI receptacle testing and North American device inspection
• Trip time display helps gauge GFCI responsiveness
• Find mode identifies the circuit breaker for a receptacle
• Backlit display, test lead holders, kickstand, and optional magnetic hanger
• Includes test leads with CAT III/CAT IV safety caps for safer testing

What’s in the box

• Right-angle test leads
• Receptacle test cord
• Instructions
• 2 x AAA batteries
• Carrying case
• Test leads with CAT III/CAT IV safety caps

With more than 160 years of engineering and manufacturing excellence, Klein Tools remains an American, family-owned brand known for durability, precision, and practical performance. The ET270 carries that legacy into a compact instrument that supports informed decision-making on electrical tasks, whether you’re on a service call or tackling a home project. It’s designed to help you work confidently, clearly, and efficiently, without overpromising results.