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Compact yellow outlet tester with three indicator lights and North American plug prongs

Klein Tools Electrical System Tool

SKU CH-TDD7-Z4VA5

Hand-powered receptacle tester identifies wiring faults in 110/125V AC outlets and survives a 6.6-foot drop

  • Team affiliation1 Piece
  • Key featuresReceptacle Tester, CSA, Hand Powered, false
  • Overall height5.5 L x 3.5 W x 1.8 H inches
  • Overall width5.5 L x 3.5 W x 1.8 H inches
  • Overall length5.5 L x 3.5 W x 1.8 H inches
  • Product typeVoltmeter
  • Clear light sequence identifies wiring faults instantly
  • Meets UL 1436 and CSA C22.2 #160 safety standards
  • Operates reliably from 32 °F to 140 °F
  • Survives 6.6-foot drops for jobsite durability
  • Tests 110/125 V AC outlets at 50/60 Hz

Klein Tools RT110 Receptacle Tester

The Klein Tools RT110 is a hand-powered outlet tester designed for electricians and maintenance professionals who need to verify wiring in standard North American 110/125V AC receptacles. It indicates correct wiring, open ground, reverse polarity, open hot, open neutral and hot/ground reversed conditions through a clear light sequence.

Fits a tool pouch for on-site diagnostics

The tester measures 5.5 by 3.5 by 1.8 inches and operates from 32 to 140 degrees Fahrenheit, so it travels easily in a technician's kit and works in unheated or outdoor environments. It requires no batteries, drawing power directly from the receptacle under test, which frees the user from managing spare cells or charging cycles.

Replaces guesswork and uncertified testers

The RT110 conforms to UL 1436 and is certified to CSA C22.2 #160, providing documented compliance that generic or unlisted testers lack. The jump is worth it when a job specification demands a listed device or when a 6.6-foot drop rating is needed for durability on commercial sites. It does not assess ground quality, detect multiple hot wires or identify combined defects.

How it compares

Measured against everything we stock in Multimeters & Electrical Testers, at today’s prices. Recalculated every night.

Price $18.99
Cheaper than about 83% of the 971 comparable items (median $30.99).

Specifications

Product
Brand nameKLEIN TOOLS, Klein Tools
Product typeVoltmeter
Size & build
Overall height5.5 L x 3.5 W x 1.8 H inches
Overall width5.5 L x 3.5 W x 1.8 H inches
Overall length5.5 L x 3.5 W x 1.8 H inches
More details
Team affiliation1 Piece

Questions about this item

How long can the RT110 operate continuously in a 140-degree F attic before heat affects its readings?

The tester is rated for continuous use up to 140 degrees F (40 degrees C), so it will maintain accurate light-sequence indications throughout a full day at that temperature.

Does the RT110 draw any power from the outlet while testing, or is it completely passive?

It is hand-powered and draws no external supply; the three indicator lamps are energised solely by the 110/125 V AC circuit under test.

What receptacle type must already be present on the circuit for the RT110 to function?

A standard North American 3-wire 110/125 V AC outlet at 50/60 Hz is required; the tester will not operate on 2-wire or higher-voltage receptacles.

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