Klein Tools ET350 4-in-1 digital circuit breaker finder showing the receiver wand and plug-in transmitter with LCD diagnostic screen.
Complete Klein ET350 kit breakdown displaying receiver wand, diagnostic transmitter, zippered storage case, manual, and 4 AAA batteries.
Dual-action electrical testing setup showing the transmitter plugged into a 120V outlet while the receiver scans breakers in a panel.
Split feature graphic illustrating non-contact voltage testing at an AC wall outlet alongside the integrated LED work light functionality.
Two-step scanning diagram demonstrating Learn Mode reading panel signals followed by Locate Mode pinpointing the target circuit breaker.
Klein ET350 transmitter wiring fault diagnostic chart showing detection of open grounds, open neutrals, reversed wires, and CAT II 135V rating.
Receiver wand scanning a breaker panel, highlighting visual LED bars and rising audio tones that confirm target breaker identification.
Product storage design graphic showing the transmitter docking directly into the receiver base, highlighting IP40 and 2-meter drop ratings.
Gloved electrician holding the Klein ET350 receiver wand in Learn Mode while scanning individual breaker switches in an electrical panel.
4-in-1 Digital Circuit Breaker (ET350) promotional video
Klein Tools ET350 4-in-1 digital circuit breaker finder showing the receiver wand and plug-in transmitter with LCD diagnostic screen.
Complete Klein ET350 kit breakdown displaying receiver wand, diagnostic transmitter, zippered storage case, manual, and 4 AAA batteries.
Dual-action electrical testing setup showing the transmitter plugged into a 120V outlet while the receiver scans breakers in a panel.
Split feature graphic illustrating non-contact voltage testing at an AC wall outlet alongside the integrated LED work light functionality.
Two-step scanning diagram demonstrating Learn Mode reading panel signals followed by Locate Mode pinpointing the target circuit breaker.
Klein ET350 transmitter wiring fault diagnostic chart showing detection of open grounds, open neutrals, reversed wires, and CAT II 135V rating.
Receiver wand scanning a breaker panel, highlighting visual LED bars and rising audio tones that confirm target breaker identification.
Product storage design graphic showing the transmitter docking directly into the receiver base, highlighting IP40 and 2-meter drop ratings.
Gloved electrician holding the Klein ET350 receiver wand in Learn Mode while scanning individual breaker switches in an electrical panel.
4-in-1 Digital Circuit Breaker (ET350) promotional video
KLEIN TOOLS

Klein Digital Circuit Breaker Finder ET350 4 in 1 (GFCI Outlet Tester Non Contact Voltage Light Transmitter Receiver Electrical Diagnostic Tool)

In stock
SKU: ET350
$79.98 USD

Description

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Klein Tools ET350 4-in-1 Digital Circuit Breaker Finder

The Klein Tools ET350 4-in-1 Digital Circuit Breaker Finder is a multifunction electrical diagnostic instrument engineered to trace breaker locations, evaluate AC outlet wiring, detect non-contact AC voltage, and illuminate dark service panels. Certified to UL STD 1436 and CSA C22.2 #160, this 18.3 oz tester utilizes a 2-step Learn and Locate receiver scanning mode alongside a plug-in transmitter that measures GFCI trip times and voltage to identify miswired electrical circuits rapidly.

Best Used For:

  • Breaker Panel Identification: Tracing individual 120V AC branch circuits and matching outlets to correct panel breakers using 2-step Learn and Locate digital signal filtering.
  • Outlet Wiring Diagnostics: Detecting wiring faults, open neutrals, reversed polarity, and measuring precise GFCI trip time intervals on standard electrical receptacles.
  • Non-Contact Voltage Tracing: Checking energized cables, cords, switches, and distribution panels safely with visual and audible signal strength indications.

Key Performance & Safety Features

  • 2-Step Learn and Locate Scanning: Receiver scans the entire breaker panel once in Learn Mode before precisely pinpointing the target breaker in Locate Mode.
  • Integrated Outlet Diagnostic Transmitter: Evaluates receptacle wiring conditions, measures line voltage, and tests GFCI circuit breaker trip speed.
  • Non-Contact AC Voltage Detector: Built-in NCVT sensor scans cables, switches, and breaker terminals with progressive visual and audible alert indicators.
  • Receiver LED Work Light: Integrated high-output LED illuminates dark breaker boxes and unlit electrical maintenance spaces.
  • Docking Transmitter Storage: Transmitter docks directly into the receiver housing for compact storage inside the included protective carrying case.
  • Dual Safety Compliance: Tested and certified to UL STD 1436 and CSA STD C22.2 #160 safety standards for professional electrical testing.

What's Included

  • (1) ET350 Digital Circuit Breaker Finder Receiver
  • (1) ET350 Outlet Diagnostic Transmitter
  • (1) Protective Carrying Case
  • (4) AAA Alkaline Batteries

Technical Specifications

Brand Klein Tools
Model Number ET350
Safety Standards Conforms to UL STD 1436; Certified to CSA STD C22.2 #160
Tester Type 4-in-1 Electronic Digital Tester
Diagnostic Functions Breaker Finding, NCVT, Outlet Diagnostics, LED Work Light
Scanning Modes 2-Step Digital Learn Mode and Locate Mode
Housing Material PC and PC-ABS Thermoplastic with Electronic Components
Power Supply 4 x AAA Batteries
Storage Feature Transmitter Docks Directly into Receiver Frame
Overall Length 11.75 in. (29.8 cm)
Overall Height & Width 3.25 in. x 6.19 in. (8.3 cm x 15.7 cm)
Product Weight 18.3 oz. (1.14 lbs / 519 g)
Pro-Tip: Pass the receiver evenly over all breaker switches during Learn Mode to baseline panel signal strength before making your final tracing pass in Locate Mode.