Front view of the Klein Tools ET270 Digital Multimeter and GFCI Receptacle Tester showing the large backlit LCD display, selection dial, and function buttons. The image includes the specialized receptacle test cord and a pair of professional-grade right-angle test leads with removable safety caps.
Product feature infographic for the Klein Tools ET270 multimeter highlighting its 600V AC/DC voltage range, 40M Ohm resistance, and CAT III 600V safety rating. Key bullet points emphasize its ability to identify common wiring faults, inspect GFCI devices with trip time data, and find corresponding circuit breakers.
Split-screen application photo demonstrating the dual functionality of the ET270. The left side shows the multimeter measuring $282.5V$ AC in an electrical panel using test leads, while the right side shows the receptacle cord testing a 120V outlet with a "Correct" wiring indication on the display.
Action shots demonstrating diagnostic capabilities: the top image shows the ET270 detecting an open ground/neutral wiring fault in a standard outlet, and the bottom image shows a technician using the GFCI button to test an outlet's trip time, displayed as 0.10 seconds.
Instructional graphic for the FIND mode feature. The top panel shows the ET270 plugged into an outlet in Find Mode, while the bottom panel shows an electrician at the breaker box where an audible tone stops once the correct corresponding circuit breaker is flipped.
Perspective view of the Klein Tools ET270 with its integrated kickstand deployed for hands-free viewing. The specialized GFCI receptacle test cord is plugged into the bottom input jacks, illustrating the secure connection for outlet diagnostics.
Rear view of the ET270 multimeter showcasing the built-in test lead storage clips and the mounting point for an optional magnetic hanger. This design keeps the red and black probes organized and accessible during transport and storage.
Full front shot of the ET270 tester with the North American 120V receptacle test cord attached. The screen displays a full segment check, highlighting the various diagnostic icons for hot, ground, and neutral wiring conditions.
A complete product kit layout for the Klein Tools ET270, featuring the digital multimeter, two AAA batteries, a pair of right-angle test leads with a safety cap, the GFCI receptacle test cord, and a durable black carrying pouch with orange trim.
A professional electrician wearing a hard hat and insulated safety gloves uses the ET270 multimeter to test a high-voltage electrical disconnect. The meter display shows a reading of 479V AC, demonstrating its reliability for industrial electrical troubleshooting.
A technician using the Klein Tools ET270 digital multimeter to test a standard 120V AC outlet. The display shows a voltage reading of 120V while simultaneously identifying an open ground wiring fault, demonstrated by the clear "Open Grd" indicator and a red alert light.
An electrician in a hard hat and protective high-voltage gloves uses the ET270 multimeter to probe a residential circuit breaker panel. The meter is placed at the base of the panel box and displays a steady reading of $275.0V$, illustrating its use in multi-phase electrical environments.
Close-up of the Klein Tools ET270 performing a GFCI trip test on a kitchen or bathroom style receptacle. The user is pressing the dedicated GFCI button, and the high-contrast display shows a trip time of 0.10 seconds, confirming the safety device is operating within specifications.
Professional application shot of the ET270 multimeter being used by a tradesman to troubleshoot a row of circuit breakers. The technician is wearing safety gear while using the red and black test leads to verify voltage across individual breakers in a complex electrical panel.
Close-up detail of the ET270 multimeter display showing $282.5V$ AC while testing industrial-grade circuit wiring. The image highlights the auto-ranging feature and the secure connection of the right-angle test leads into the common and voltage input jacks.
Digital Multi-Tester DMM with Receptacle Tester (ET270) promotional how to video
Front view of the Klein Tools ET270 Digital Multimeter and GFCI Receptacle Tester showing the large backlit LCD display, selection dial, and function buttons. The image includes the specialized receptacle test cord and a pair of professional-grade right-angle test leads with removable safety caps.
Product feature infographic for the Klein Tools ET270 multimeter highlighting its 600V AC/DC voltage range, 40M Ohm resistance, and CAT III 600V safety rating. Key bullet points emphasize its ability to identify common wiring faults, inspect GFCI devices with trip time data, and find corresponding circuit breakers.
Split-screen application photo demonstrating the dual functionality of the ET270. The left side shows the multimeter measuring $282.5V$ AC in an electrical panel using test leads, while the right side shows the receptacle cord testing a 120V outlet with a "Correct" wiring indication on the display.
Action shots demonstrating diagnostic capabilities: the top image shows the ET270 detecting an open ground/neutral wiring fault in a standard outlet, and the bottom image shows a technician using the GFCI button to test an outlet's trip time, displayed as 0.10 seconds.
Instructional graphic for the FIND mode feature. The top panel shows the ET270 plugged into an outlet in Find Mode, while the bottom panel shows an electrician at the breaker box where an audible tone stops once the correct corresponding circuit breaker is flipped.
Perspective view of the Klein Tools ET270 with its integrated kickstand deployed for hands-free viewing. The specialized GFCI receptacle test cord is plugged into the bottom input jacks, illustrating the secure connection for outlet diagnostics.
Rear view of the ET270 multimeter showcasing the built-in test lead storage clips and the mounting point for an optional magnetic hanger. This design keeps the red and black probes organized and accessible during transport and storage.
Full front shot of the ET270 tester with the North American 120V receptacle test cord attached. The screen displays a full segment check, highlighting the various diagnostic icons for hot, ground, and neutral wiring conditions.
A complete product kit layout for the Klein Tools ET270, featuring the digital multimeter, two AAA batteries, a pair of right-angle test leads with a safety cap, the GFCI receptacle test cord, and a durable black carrying pouch with orange trim.
A professional electrician wearing a hard hat and insulated safety gloves uses the ET270 multimeter to test a high-voltage electrical disconnect. The meter display shows a reading of 479V AC, demonstrating its reliability for industrial electrical troubleshooting.
A technician using the Klein Tools ET270 digital multimeter to test a standard 120V AC outlet. The display shows a voltage reading of 120V while simultaneously identifying an open ground wiring fault, demonstrated by the clear "Open Grd" indicator and a red alert light.
An electrician in a hard hat and protective high-voltage gloves uses the ET270 multimeter to probe a residential circuit breaker panel. The meter is placed at the base of the panel box and displays a steady reading of $275.0V$, illustrating its use in multi-phase electrical environments.
Close-up of the Klein Tools ET270 performing a GFCI trip test on a kitchen or bathroom style receptacle. The user is pressing the dedicated GFCI button, and the high-contrast display shows a trip time of 0.10 seconds, confirming the safety device is operating within specifications.
Professional application shot of the ET270 multimeter being used by a tradesman to troubleshoot a row of circuit breakers. The technician is wearing safety gear while using the red and black test leads to verify voltage across individual breakers in a complex electrical panel.
Close-up detail of the ET270 multimeter display showing $282.5V$ AC while testing industrial-grade circuit wiring. The image highlights the auto-ranging feature and the secure connection of the right-angle test leads into the common and voltage input jacks.
Digital Multi-Tester DMM with Receptacle Tester (ET270) promotional how to video
KLEIN TOOLS

Klein Tools Electrical Tester ET270 600V Multimeter Receptacle Kit (Auto Ranging TRMS 4000 Count LCD Breaker Finder GFCI Safety Outlet Diagnostic)

Only 2 left
SKU: ET270
$64.98 USD

Description

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Locate Distribution Breakers and Track Circuit Interrupter Trip Durations Instantly With Dedicated Digital Diagnostic Signal Mapping

The Klein Tools ET270 is an automatically ranging digital multi-tester and integrated outlet analyzer engineered for verifying residential or commercial networks up to 600V AC/DC. This professional test instrument incorporates an innovative digital breaker mapping mode that identifies the exact control switch matching an assigned branch terminal junction. Operating within a certified CAT III 600V safety envelope, the device provides a 4000-count backlit LCD screen, a 40MΩ resistance matrix, and a ground-fault interrupter tracking cord to execute complete load performance diagnostics and battery health checks.

Best Used For:

  • Breaker Panel Mapping: Utilizing the diagnostic transmitter function to map specific active wall receptacle ports straight back to individual service panel slots.
  • Interrupter Performance Logs: Simulating active faults to capture the exact mechanical trip time of residential ground-fault circuit protection mechanisms.
  • DC Conductor Testing: Verifying secondary power drops, low-voltage accessories, and the chemical health of local 1.5V or 9V field battery blocks.

Key Performance & Safety Features

  • Integrated Breaker Mapping: Specialized identification sub-mode tracks local plug lines directly to upstream switches to eliminate panel tracing delays.
  • Dual Purpose Architecture: Merges a comprehensive 4000-count digital multimeter system frame with a high-stakes three-prong wall outlet loop checker.
  • Automated Range Selection: Auto-ranging microcircuit selectors shift matching parameters to active line properties with a manual push override button.
  • Five-Point Structural Auditing: Included plug interface maps structural errors like missing grounds, reverse polarities, open hot legs, and open neutrals.
  • Double Insulated Frame: Class 2 engineered ABS polymer shock outer shell passes concrete deck drop verification tests up to 6.6 feet.

What's Included

  • ET270 Digital Multimeter / GFCI Tester
  • Set of Right-Angle Test Leads
  • Receptacle Test Cord
  • Padded Storage Pouch
  • Two AAA Batteries
  • Instruction Manual

Technical Specifications

Primary Testing Purpose: Electrical Testing, Measuring, and Diagnostics
Voltage Measuring Bounds: 600V AC / 600V DC
Industrial Safety Certification: CAT III 600V; Class 2 Double Insulation
Maximum Loop Resistance: 40MΩ
Nominal Operating Frequency: 50 to 60Hz
Chassis Drop Protection: 6.6 ft. (2 m)
Display Interface Profile: 4000 Count LCD with Backlight
Power Source Requirements: 2 x AAA Alkaline Batteries
Tester Chassis Length: 6.41 in.
Tester Chassis Width: 3.13 in.
Tester Chassis Height: 1.84 in.
Total Package Net Weight: 21.1 oz.
Pro-Tip: When running path maps in old commercial panels using FIND mode, keep your lead interface connection steady for three full seconds; this allows the tester logic arrays to stabilize signal tracking over high-interference lines.