A direct front view of the orange Klein Tools RT210 GFCI outlet tester featuring a three-prong plug, a black GFCI test button, and a printed wiring condition legend.
A product informational graphic highlighting that the tester detects common wiring problems, confirms ground fault protective device operation, and works on nominal 110 to 125V AC 3-wire outlets.
Action shot showing the RT210 tester plugged into a white wall outlet; two orange lights are illuminated on the end of the tool to indicate the wiring condition.
A close-up action shot showing a person's thumb pressing the black GFCI test button while the orange tester is plugged into a professional-grade metallic electrical box.
An angled perspective view of the orange receptacle tester showcasing the ergonomic ribbed sides and the three transparent light indicators at the base.
A low-angle perspective view of the tool highlighting the standard three-prong electrical connector and the durable polymer housing.
A top-down angled view of the RT210 outlet tester showing the diagnostic light interface and the sleek, compact profile of the device.
Test & Measurement 2015 promotional video
A direct front view of the orange Klein Tools RT210 GFCI outlet tester featuring a three-prong plug, a black GFCI test button, and a printed wiring condition legend.
A product informational graphic highlighting that the tester detects common wiring problems, confirms ground fault protective device operation, and works on nominal 110 to 125V AC 3-wire outlets.
Action shot showing the RT210 tester plugged into a white wall outlet; two orange lights are illuminated on the end of the tool to indicate the wiring condition.
A close-up action shot showing a person's thumb pressing the black GFCI test button while the orange tester is plugged into a professional-grade metallic electrical box.
An angled perspective view of the orange receptacle tester showcasing the ergonomic ribbed sides and the three transparent light indicators at the base.
A low-angle perspective view of the tool highlighting the standard three-prong electrical connector and the durable polymer housing.
A top-down angled view of the RT210 outlet tester showing the diagnostic light interface and the sleek, compact profile of the device.
Test & Measurement 2015 promotional video
KLEIN TOOLS

Klein Tools RT210 GFCI Outlet Tester for GFCI Receptacles 110-125V AC 3-Wire Electrical Circuit Diagnostic Tool Wiring Condition Chart Drop Protection

Only 3 left
SKU: RT210
$13.98

Description

Ensure Fast and Accurate Electrical Troubleshooting with the Klein Tools RT210 GFCI Receptacle Tester

The Klein Tools RT210 is an essential diagnostic tool for electricians, home inspectors, and maintenance professionals who need to quickly verify the safety and functionality of electrical outlets. Designed for professional-grade reliability, this tester identifies the most common wiring errors in both standard and GFCI 3-wire receptacles, including open ground, reverse polarity, and open hot conditions. Whether you are verifying a new installation or troubleshooting existing circuits, the RT210 provides immediate visual feedback to ensure every outlet is wired correctly and safely.

Efficiency is built into the design with a convenient, easy-to-read coding chart printed directly on the tool, allowing you to cross-reference light results instantly without reaching for a manual. Beyond simple detection, the RT210 features a dedicated GFCI test function to confirm the proper operation of ground fault protective devices. Built to survive the demands of the jobsite, this rugged unit is engineered with 6.6-foot (2m) drop protection, ensuring it continues to perform even after the inevitable tumbles from a tool belt or ladder. Compact and lightweight at just 1.9 ounces, it is the perfect pocket-sized companion for any electrical toolkit.

Key Features

  • Comprehensive Diagnostic Capability: Detects common wiring problems including open ground, reverse polarity, open hot, open neutral, and hot/ground reversed.
  • GFCI Verification: Specifically designed to work on GFCI outlets to confirm the operation of ground fault protective devices.
  • Instant Reference Chart: Features a high-visibility chart on the tester body to help determine wiring conditions based on light results.
  • Industrial Durability: Rugged construction built to withstand a 6.6-foot (2 meter) drop for long-term jobsite reliability.
  • Broad Operating Range: Designed for nominal 110/125V AC systems at 50/60Hz in standard 3-wire outlets.
  • Optimized Form Factor: Compact and lightweight design allows for easy storage and portability in a tool pouch or pocket.

What's Included

  • (1) RT210 GFCI and Standard Receptacle Tester

Specifications

Type GFCI and Standard Receptacle Tester
Application Determine Wiring Condition in Outlet
Nominal Voltage 110/125V AC at 50/60Hz
Safety Standard CAT II 300V
Drop Protection 6.6 feet (2 meters)
Operating Temperature 32°F to 140°F (0°C to 40°C)
Overall Length 1.62 inches
Overall Height 2.88 inches
Overall Width 1.88 inches
Weight 1.9 oz
UPC 092644690273

Pro-Tip: When testing GFCI outlets, always verify the wiring condition using the light chart before pressing the GFCI test button. If the tester indicates an "Open Ground" or "Reverse Polarity," the GFCI test may not function correctly, and you should address the wiring fault before proceeding with the safety trip test.