The Klein Tools ET270 is an auto-ranging digital multi-tester combining a 4000-count LCD multimeter with a built-in GFCI receptacle tester and circuit breaker finder function. It measures AC/DC voltage up to 600V, resistance up to 40 MΩ, continuity, and battery condition. The receptacle test cord enables wiring fault detection and GFCI trip time measurement in North American 120V outlets without separate test leads. Rated CAT III 600V with double insulation and 6.6-foot drop protection. Includes right-angle leads, receptacle cord, and storage pouch. Backed by Klein Tools' 1-year limited warranty.
What does 'auto-ranging' mean on the ET270?
The meter automatically selects the correct measurement range — no manual dial rotation required. Select the function (voltage, resistance, etc.) and take the reading directly. Reviewers consistently call out this as reducing the learning curve compared to manual-ranging meters.
How does the built-in GFCI tester work?
A test cord plugs into the outlet. The ET270 reads the wiring condition and includes a test button that trips the GFCI to confirm protection is active — eliminating the need to carry a separate outlet tester. Reviewers have used it to verify GFCI function after installation and to diagnose outlet faults during troubleshooting.
Can the ET270 find which circuit breaker controls a specific outlet?
Yes — the circuit breaker finder transmits a signal from the outlet that a receiver (included) picks up at the panel to identify the correct breaker without guessing or turning them off one by one.
Does the ET270 test AFCI protection?
No — the ET270 tests GFCI protection only. For AFCI testing you need the RT310, which contains an actual arc generator to trip AFCI breakers and receptacles.
What measurements can the ET270 take?
AC/DC voltage up to 600V, resistance up to 40MΩ, continuity with audible beep, battery voltage, and GFCI outlet testing. The 4000-count LCD display resolves readings to one decimal in most ranges.
Is it suitable for a homeowner or only for professionals?
Both. Reviewers include homeowners diagnosing landscape lighting and GFCI outlets alongside field technicians using it daily on job sites. The auto-ranging and intuitive layout remove most of the complexity that makes traditional multimeters intimidating.
# Klein Tools® ET270 Auto-Ranging Digital Multi-Tester with Standard/GFCI Receptacle Tester **Model:** `ET270` **Brand:** Klein Tools **Category:** Voltage Tester > The Klein Tools ET270 is an auto-ranging digital multi-tester combining a 4000-count LCD multimeter with a built-in GFCI receptacle tester and circuit breaker finder function. It measures AC/DC voltage up to 600V, resistance up to 40 MΩ, continuity, and battery condition. The receptacle test cord enables wiring fault detection and GFCI trip time measurement in North American 120V outlets without separate test leads. Rated CAT III 600V with double insulation and 6.6-foot drop protection. Includes right-angle leads, receptacle cord, and storage pouch. Backed by Klein Tools' 1-year limited warranty. ## Specifications | Attribute | Value | |---|---| | Product Type | Auto-Ranging Digital Multi-Tester with GFCI Receptacle Tester | | Voltage Range Ac | 600V AC | | Voltage Range Dc | 600V DC | | Resistance Range | 40 MΩ | | Frequency | 50–60 Hz | | Cat Rating | CAT III 600V | | Tests Gfci | Yes | | Tests Afci | No | | Tests Continuity | Yes | | Tests Battery | Yes | | Finds Breaker | Yes | | Display Type | 4000 Count LCD | | Battery Type | 2 × AAA | | Battery Required | Yes | | Drop Protection Ft | 6.6 | | Overall Length In | 6.41 | | Assembled Weight Oz | 21.1 | | Barcode (UPC) | 092644694219 | | Warranty | 1-year limited | ## What's Included - Digital multimeter - Right-angle test leads - Receptacle test cord - 2 × AAA batteries - User manual - Storage pouch Source: https://www.jaspecs.com/klein-tools/voltage-tester/et270-klein-tools-auto-ranging-digital-multi-tester-standardgfci-receptacle-tester/