Klein Tools Digital Multimeter...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$139.10
$95.86
Klein Tools Digital Multi-Tester, Multimeter with Receptacle Tester

Klein Tools Digital Multimeter 600V AC/DC Auto-Range GFCI Receptacle Tester Breaker Finder

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Model: ET270
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In Stock (leaves warehouse same day if ordered before 3pm ET)

$139.10
$95.86
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Klein Tools Digital Multimeter 600V AC/DC Auto-Range GFCI Receptacle Tester Breaker Finder

Professional-Grade Multi-Function Electrical Testing Equipment

The Klein Tools Digital Multimeter with GFCI Receptacle Tester delivers professional-grade electrical testing performance for comprehensive electrical diagnostics and troubleshooting. This rugged ABS construction digital multimeter features advanced FIND mode technology and integrated GFCI testing capabilities designed for electricians, linemen, and electrical professionals, providing the reliable performance and industry-leading quality that tradesmen demand from America's most trusted tool manufacturer.

Professional Features & Benefits

Advanced Testing Capabilities

  • FIND Mode Breaker Identification - Instantly identifies which breaker corresponds to any given receptacle, eliminating guesswork and reducing troubleshooting time with Klein's precision engineering
  • GFCI Trip Time Analysis - Measures and displays the exact time required to trip GFCI devices, ensuring proper safety device operation with professional-grade accuracy
  • Comprehensive Wiring Fault Detection - Detects and identifies common wiring problems in standard and GFCI electrical outlets, providing complete diagnostic capabilities for electrical professionals
  • Auto-Range Digital Multimeter - Measures AC/DC voltage up to 600V, resistance up to 40MΩ, audible continuity, and performs 9V and 1.5V battery tests with Klein Tools precision

Rugged Professional Construction

  • 6.6-Foot Drop Protection - Built to withstand demanding job site conditions with Klein's rigorous durability testing standards for reliable field performance
  • 4000 Count LCD Display - High-resolution backlit display provides clear readings in all lighting conditions with data hold functionality for convenient measurement recording
  • CAT III 600V Safety Rating - Meets professional electrical safety standards with double insulation protection for safe operation on electrical systems

Technical Specifications

Voltage Range: 600V AC/DC, Resistance: 40MΩ, Frequency: 50-60Hz, Display: 4000 Count LCD with backlight, Accuracy: ±(% of Reading + LSD) at 65°F to 83°F, Drop Protection: 6.6 feet (2m), Safety Rating: CAT III 600V Class 2 Double Insulation, Power: 2 x AAA batteries, Dimensions: 6.41" L x 3.13" W x 1.84" H, Weight: 0.57 lbs, Construction: ABS and electrical components, Color: Orange/Black professional Klein Tools design

Installation & Usage

  1. Verify meter operation by testing known voltage source before each use, following Klein Tools safety protocols
  2. Connect right-angle test leads to multimeter for voltage, resistance, and continuity measurements with secure professional connections
  3. Use receptacle test cord to plug into 120V AC outlets for comprehensive wiring fault analysis and GFCI testing
  4. Activate FIND mode to identify corresponding circuit breaker by plugging tester into receptacle and checking panel
  5. Monitor LCD display for clear readings with backlight activation in low-light conditions and data hold for recording measurements
  6. Test GFCI devices by observing trip time display to ensure proper safety device operation within electrical code requirements

Professional Applications

Ideal for:

  • Electrical Installation - New construction wiring verification, outlet testing, and circuit identification for residential and commercial electrical work
  • Troubleshooting and Repair - Diagnosing electrical faults, GFCI problems, and circuit breaker identification for efficient electrical maintenance
  • Safety Inspections - GFCI device testing, outlet wiring verification, and electrical system safety compliance for professional electrical inspections
  • Residential Electrical Work - Home electrical repairs, outlet installation verification, and circuit identification for residential electrical contractors
  • Commercial Electrical - Office building electrical maintenance, retail electrical troubleshooting, and commercial GFCI testing applications
  • Industrial Maintenance - Factory electrical diagnostics, equipment troubleshooting, and electrical system maintenance with professional-grade accuracy
  • HVAC Electrical - Heating and cooling system electrical diagnostics, control circuit testing, and electrical component verification
  • Telecommunications - Communication system electrical testing, power supply verification, and electrical infrastructure maintenance

Multi-Function Testing Advantage

Klein Tools engineering combines multiple essential electrical testing functions into one professional instrument, eliminating the need for separate meters, receptacle testers, and breaker finders. The integrated design provides comprehensive electrical diagnostics with the precision manufacturing, safety testing, and durability standards that electrical professionals require for reliable field performance and accurate troubleshooting results.

Why Choose Klein Tools Quality?

Since 1857, Klein Tools has maintained its legacy of excellence as America's premier electrical tool manufacturer, delivering uncompromising quality and innovation to electrical professionals. This digital multimeter represents Klein's commitment to professional safety standards, rigorous testing protocols, and trusted reliability that electricians and electrical contractors depend on for critical electrical testing and diagnostics in demanding professional environments.



KLN-ET270 - spec sheet

Manufacturer Resources

Product Specs

Accuracy:
65°F to 83°F (18°C to 28°C) - +/- (% of Reading + Number of Least Significant Digits)
Application:
Testing and Measuring Voltage; Detects and Identifies Common Wiring Problems in GFCI Receptacles
Batteries:
2 x AAA
Display:
4000 Count LCD
Drop Protection:
6.6' (2 m)
Frequency:
50 to 60Hz
Included:
Digital Multimeter; Right-Angle Test Leads; Receptacle Test Cord; Batteries; User Manual; Storage Pouch
Ohms Resistance:
40MΩ
Overall Height:
1.84" (4.5 cm)
Overall Length:
6.41" (16.3 cm)
Overall Width:
3.13" (7.9 cm)
Standard:
CAT III 600V, Class 2, Double insulation
Product Type:
Digital Multimeter and GFCI Receptacle Tester
Department:
Electrical
Product Group:
Test & Measurement
Product Subgroup:
Electrical Testers
Product Voltage:
600V AC/DC
Product Function:
AC/DC Voltage; Resistance; Continuity; Battery Test; Finds Breaker to Corresponding Receptacle; Shows Amount of Time it Takes to Trip GFCI; Detects and Identifies Common Wiring Problems in GFCI Receptacles
Product Details:
Digital Multimeter and GFCI Receptacle Tester
Product Color:
Orange/ Black
Product Height:
1.8400 in
Product Material:
ABS and Electrical Components
Product Category:
Multimeters
Product Weight:
0.5650 lbs
Product Width:
3.1300 in
Product Depth:
6.4100 in

Klein Tools ET270 – Frequently Asked Questions

1) Can the Klein ET270 tell me which breaker feeds a specific outlet without a separate transmitter?
Yes. The ET270 has a FIND mode that identifies the breaker corresponding to a given receptacle, so you plug the receptacle test cord into the outlet and work the panel with the same tool you are metering with. The receptacle cord and right-angle test leads both come in the box, so there is no separate transmitter or receiver pair to buy or keep batteries in. That matters on service calls where you would otherwise be carrying a meter, a three-light tester and a circuit tracer.
2) Is the Klein ET270 safe to use on a commercial panel or just on receptacles?
The ET270 carries a CAT III 600V rating with Class 2 double insulation, which covers distribution level work: panelboards, feeders, branch circuits and hardwired equipment inside a building. It is not rated for CAT IV service entrance work, so the utility side of the service, outdoor drops and the line side of the main are outside what this instrument is rated for. Measurement tops out at 600V AC/DC, so a 480V three phase panel is in range and anything above 600V is not.
3) Will the ET270 verify that a GFCI outlet trips within code time, or does it only trip it?
It measures and displays the actual trip time, not just whether the device trips. That is the difference between a three-light tester with a test button and a real inspection record: you get a number you can write down for a GFCI verification on a rental turnover, a healthcare or hospitality inspection round, or a post-install punch list. It also detects and identifies common wiring faults in GFCI and standard receptacles on the same plug-in, so open ground, reversed polarity and similar problems show up in the same step.
4) Does the ET270 replace a separate multimeter, or is it only a receptacle tester with a display?
It is a full auto-ranging digital multimeter first. AC and DC voltage to 600V, resistance to 40M ohms, audible continuity, and 9V and 1.5V battery checks, read on a 4000 count LCD with backlight and data hold. The receptacle and breaker-finding functions sit on top of that. For an electrician carrying one tool, the practical limit is that the measurement set is voltage, resistance and continuity, so if you need current you still need a clamp meter alongside it.
5) What do I get in the box with the Klein ET270 and what else do I need to buy?
The kit ships with the meter, right-angle test leads, the receptacle test cord, batteries, a user manual and a storage pouch. Nothing further is required to start testing. Consumables to keep on the shelf are 2 x AAA cells for the meter. No separate leads, adapters or transmitter need ordering.
6) Will the ET270 survive being dropped off a ladder on a job site?
It is rated for a 6.6 foot (2 m) drop, so a fall from a step ladder or off a scaffold plank is inside what the housing is built for. The body is ABS, and the meter weighs 0.565 lbs at 6.41 x 3.13 x 1.84 inches, so it rides in a pouch on the belt rather than in a case. The storage pouch is included.
7) Is 40M ohms enough resistance range for checking HVAC control circuits and thermostat wiring?
Yes for that work. Resistance reads to 40M ohms with auto-ranging, which covers thermostat and low voltage control runs, coil and relay windings, and checking a conductor for an open. Audible continuity means you can buzz out a pulled run without watching the screen. For insulation resistance testing on motor windings you need a megohmmeter instead, that is a different instrument and a different test voltage.
8) What is the Klein part number for this multimeter and receptacle tester?
The Klein Tools catalog number is ET270, a digital multimeter and GFCI receptacle tester in the orange and black Klein housing. That is the number to quote for a standardized tool list or a fleet order across crews.
9) Can a property manager use the ET270 to check outlets in units without being an electrician?
The receptacle side of it is plug-in simple: the test cord goes into a 120V outlet and the display calls out common wiring faults and the GFCI trip time, which is enough to document a unit turnover or an annual GFCI check across a portfolio. The meter side, voltage and resistance at up to 600V on a CAT III rated instrument, is for someone qualified to open a panel or work energized. Buy it for the maintenance tech who does both, not for the office.
How fast can I get the Klein Tools ET270 delivered?
Most orders ship the same day from our distribution partners, with quick delivery throughout the continental U.S. Need it urgently? Contact Us for expedited shipping options.
Can I return it if it doesn’t work for me?
Yes—ZenSupply offers a hassle-free return policy. If the product isn’t the right fit, reach out to our support team for a return authorization or setup a return by following our return instructions.
Does the Klein Tools ET270 come with a warranty?
Absolutely. The Klein Tools ET270 is backed by a manufacturer’s warranty. For full warranty terms, check the product documentation or Contact Us.
How do I get technical support or installation help for the Klein Tools ET270?
You can call, text, or email our expert support team for fast answers. We’re here to help with product selection, installation tips, and troubleshooting. Contact Us
Why buy the Klein Tools ET270 from ZenSupply?
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