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 Outlet Tester RT210 110-125V AC Receptacle (GFCI Circuit Diagnostics Fault Light Indicator Chart 6.6ft Drop Protection Hand Tool Pack)

Only 3 left
SKU: RT210
$13.98 USD

Description

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Commercial-Grade 110-125V AC Receptacle Diagnostic Tool with Integrated GFCI Trip Sensor, High-Visibility Fault Code Chart, and 6.6-Foot Drop Rating

The Klein Tools RT210 GFCI Outlet Tester delivers commercial electrical diagnosis utility and absolute circuit safety verification across residential and light commercial jobsites. Engineered for nominal 110-125V AC lines at 50/60Hz, this specialized 3-wire plug-in instrument intercepts common wiring failures by illuminating a sequential neon indicator light matrix. This high-efficiency troubleshooting solution resolves hidden neutral faults, dangerous reversed polarity setups, open ground paths, and non-tripping safety breakers by combining a dedicated mechanical ground-fault interrupter actuator with an onboard, cross-reference telemetry chart. Rated at a highly portable 1.9 ounces and shielded by a rugged housing certified for 6.6-foot impact drops, this compact tester optimizes field assessment workflows inside structural junction boxes and distribution panels.

Best Used For:

  • New Installation Verification: Auditing newly installed 3-wire standard electrical outlets to confirm that ground, hot, and neutral lines are isolated and landed properly.
  • GFCI Breaker Field Auditing: Simulating active leakage current parameters on wet-location kitchen and bathroom safety circuits to verify immediate ground-fault interruption response.
  • Property Inspection Diagnostics: Running rapid diagnostic routing sequences across unfamiliar building circuits to intercept open ground pathways or hot/neutral reversals.

Key Performance & Safety Features

  • Five-Fault Diagnostic Logic: Precision circuitry instantly identifies open grounds, open neutrals, open hots, hot/ground reversals, and reversed polarity errors.
  • Ground Fault Protective Testing: An integrated test button introduces a calibrated load to safely verify that upstream sub-circuit GFCI sensors trigger within safety targets.
  • On-Body Reference Coding: A high-contrast color legend block printed permanently onto the tool profile maps light combinations for immediate status interpretation.
  • 6.6-Foot Impact Armor: Rugged poly-blend casing is structurally rated to survive 2-meter drop shocks from utility belts, step ladders, or high framing structures.
  • CAT II 300V Safety Profile: Certified to standard high-voltage isolation rules to insulate the tool operator cleanly during real-time low-voltage line checking.

What's Included

  • (1) RT210 GFCI and Standard Receptacle Circuit Tester

Technical Specifications

Specification Value
Brand Name Klein Tools
Model Number RT210
Device Category Type GFCI and Standard Receptacle Tester
Operating Voltage Band 110/125V AC at 50/60Hz Frequency
Safety Standard Rating CAT II 300V
Impact Drop Rating 6.6 ft. (2 meters)
Operating Temperature Range 32°F to 140°F (0°C to 40°C)
Overall Body Length 1.62 in.
Overall Body Width 1.88 in.
Overall Body Height 2.88 in.
Net Instrument Weight 1.9 oz.
Universal Global UPC 092644690273

Pro-Tip: This diagnostic tool is strictly engineered to intercept wiring faults inside standard 3-wire interfaces and will not detect combination multi-conductor cross-wiring errors or ground loop conditions. Always couple light chart observations with a dedicated digital voltmeter if troubleshooting complex secondary line derivations.