An angled studio shot of the Klein Tools RT250 GFCI receptacle tester. The device features a rugged orange housing, a 3-wire North American plug, and a large digital LCD screen currently displaying Correct wiring status alongside various fault detection indicators.
Infographic for the Klein Tools RT250 outlet tester highlighting key technical features. Callouts identify the large backlit LCD for voltage and trip time, the bright green and red LED visual indicators, the Auto-Hold function for hard-to-reach areas, and the specific compatibility with North American 3-wire 120V electrical outlets.
A comprehensive feature graphic for the RT250 electrical tester. The image lists detectable wiring conditions including Correct, Open Ground, Open Neutral, Open Hot, Reversed Hot/Ground, and Reversed Hot/Neutral. Technical icons showcase the 2-meter drop protection and CAT II 135V safety rating.
A high-angle perspective view of the Klein Tools RT250 tester against a white background. The image clearly shows the integrated electrical prongs, the GFCI test button, the power/reset button, and the dual LED windows at the base of the device.
A low-angle perspective shot of the RT250 GFCI tester, emphasizing the ergonomic side grips and the clear digital display. The device is oriented to show the bottom-mounted LED indicator lights used for secondary fault confirmation.
The rear view of the Klein Tools RT250 receptacle tester. The orange polymer casing displays molded safety warnings, the CAT II 135V rating, and the battery compartment door designed for two AAA alkaline batteries.
Two-part action shot showing the RT250 in professional use. The top frame demonstrates testing a standard wall outlet with a Correct 120V reading, while the bottom frame shows the tester identifying a reversed neutral fault in an industrial-style metal electrical box.
Close-up action shot of the Klein Tools RT250 identifying a Hot/Neutral Reversed wiring fault in an exposed metal junction box. The LCD is clearly backlit, displaying the specific fault code and current voltage in an active construction environment.
A technician's hand inserting the RT250 GFCI tester into a standard residential wall outlet. The blue backlit LCD provides a clear, steady 120V reading, and the green LED is illuminated to signify a correctly wired circuit.
The RT250 receptacle tester shown plugged into a GFCI outlet with a brushed metal wall plate. The Auto-Hold feature is demonstrated, maintaining a clear voltage reading on the backlit display during a professional home inspection.
Action shot of a gloved hand using the Klein Tools RT250 to perform a GFCI trip test on a wall outlet. The backlit LCD display shows a precise trip time of 0.09 seconds, illustrating the tool's ability to verify the safety and responsiveness of ground fault circuit interrupters.
A close-up of the RT250 electrical tester identifies an Open Ground and Open Neutral fault in an industrial metal electrical box. The high-contrast LCD displays a low voltage reading of 30V, and the red LED fault indicator is illuminated to provide a clear warning of unsafe wiring conditions.
GFCI Receptacle Tester with LCD, RT250 promotional how to video
An angled studio shot of the Klein Tools RT250 GFCI receptacle tester. The device features a rugged orange housing, a 3-wire North American plug, and a large digital LCD screen currently displaying Correct wiring status alongside various fault detection indicators.
Infographic for the Klein Tools RT250 outlet tester highlighting key technical features. Callouts identify the large backlit LCD for voltage and trip time, the bright green and red LED visual indicators, the Auto-Hold function for hard-to-reach areas, and the specific compatibility with North American 3-wire 120V electrical outlets.
A comprehensive feature graphic for the RT250 electrical tester. The image lists detectable wiring conditions including Correct, Open Ground, Open Neutral, Open Hot, Reversed Hot/Ground, and Reversed Hot/Neutral. Technical icons showcase the 2-meter drop protection and CAT II 135V safety rating.
A high-angle perspective view of the Klein Tools RT250 tester against a white background. The image clearly shows the integrated electrical prongs, the GFCI test button, the power/reset button, and the dual LED windows at the base of the device.
A low-angle perspective shot of the RT250 GFCI tester, emphasizing the ergonomic side grips and the clear digital display. The device is oriented to show the bottom-mounted LED indicator lights used for secondary fault confirmation.
The rear view of the Klein Tools RT250 receptacle tester. The orange polymer casing displays molded safety warnings, the CAT II 135V rating, and the battery compartment door designed for two AAA alkaline batteries.
Two-part action shot showing the RT250 in professional use. The top frame demonstrates testing a standard wall outlet with a Correct 120V reading, while the bottom frame shows the tester identifying a reversed neutral fault in an industrial-style metal electrical box.
Close-up action shot of the Klein Tools RT250 identifying a Hot/Neutral Reversed wiring fault in an exposed metal junction box. The LCD is clearly backlit, displaying the specific fault code and current voltage in an active construction environment.
A technician's hand inserting the RT250 GFCI tester into a standard residential wall outlet. The blue backlit LCD provides a clear, steady 120V reading, and the green LED is illuminated to signify a correctly wired circuit.
The RT250 receptacle tester shown plugged into a GFCI outlet with a brushed metal wall plate. The Auto-Hold feature is demonstrated, maintaining a clear voltage reading on the backlit display during a professional home inspection.
Action shot of a gloved hand using the Klein Tools RT250 to perform a GFCI trip test on a wall outlet. The backlit LCD display shows a precise trip time of 0.09 seconds, illustrating the tool's ability to verify the safety and responsiveness of ground fault circuit interrupters.
A close-up of the RT250 electrical tester identifies an Open Ground and Open Neutral fault in an industrial metal electrical box. The high-contrast LCD displays a low voltage reading of 30V, and the red LED fault indicator is illuminated to provide a clear warning of unsafe wiring conditions.
GFCI Receptacle Tester with LCD, RT250 promotional how to video
KLEIN TOOLS

Klein Tools RT250 GFCI Receptacle Tester Backlit LCD Display Voltage Reading Fault Detection Auto-Hold Feature 3-Wire 120V Outlet Testing Pro Grade

Only 3 left
SKU: RT250
$24.97

Description

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Precision Electrical Diagnostics: The Klein Tools RT250 LCD GFCI Receptacle Tester

The Klein Tools RT250 is a sophisticated electrical diagnostic tool designed for professional electricians, home inspectors, and DIY enthusiasts who demand more than a simple light-sequence tester. Specifically engineered for North American 3-wire 120V electrical outlets, this tester features a large, easy-to-read backlit LCD that provides real-time voltage readings and clear, descriptive wiring fault identifications. Beyond standard outlet testing, the RT250 is an essential tool for inspecting GFCI devices, providing a precise digital readout of the exact time required to trip the ground fault circuit interrupter. Whether you are verifying a new installation or troubleshooting an older home, the RT250 ensures your electrical systems are safe, compliant, and functioning correctly.

Engineered for efficiency and jobsite durability, the RT250 includes a patent-pending detection system for complex Open Neutral and Open Ground wiring faults. One of its most standout features is the Auto-Hold functionality, which is incredibly useful when testing outlets in hard-to-reach areas or behind furniture; the display retains the reading so you can view it safely after removing the tester. Integrated bright green and red LEDs complement the digital display for instant visual confirmation, while the rugged ABS housing is drop-protected up to 6.6 feet (2 meters). Compact enough to fit in a pocket but powerful enough for industrial use, this CAT II 135V rated tester is the definitive solution for comprehensive receptacle health checks.

Key Features

  • Backlit LCD Display: Provides clear voltage readouts and identifies wiring faults in plain text for easy interpretation.
  • GFCI Trip Time: Measures and displays the exact time required to trip a GFCI device, ensuring safety compliance.
  • Patent-Pending Fault Detection: Specifically detects and identifies "Open Neutral Open Ground" wiring faults.
  • Auto-Hold Function: Automatically holds the reading on the display, perfect for testing outlets in restricted or dark spaces.
  • Visual LED Indicators: High-visibility green and red LEDs provide immediate pass/fail status of the outlet wiring.
  • Jobsite Tough: Constructed from durable ABS with 6.6-foot (2-meter) drop protection and a CAT II 135V safety rating.

What's Included

  • (1) RT250 GFCI Receptacle Tester with LCD
  • (2) 1.5V AAA Alkaline Batteries
  • (1) User Manual

Specifications

Product Type GFCI Receptacle Tester
Voltage Rating 135V AC
Safety Rating CAT II 135V
Display Backlit LCD
GFCI Testing Yes (Includes Trip Time)
Drop Protection 6.6 ft (2 m)
Batteries 2 x AAA (Included)
Overall Length 4.5 in
Overall Width 2.0 in
Overall Height 1.1 in
Weight 4.8 oz
UPC 092644693212

Pro-Tip: When testing GFCI outlets, a trip time between 25ms and 40ms is typical for a healthy device. If the RT250 shows a trip time significantly higher or fails to trip the device, the GFCI is likely faulty and should be replaced immediately to ensure user safety from electrical shocks.