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

Klein Tools RT210 GFCI Outlet Tester electrical system tool

SKU CH-B3CJ-CAGRD

Tests standard and GFCI outlets for common wiring faults and confirms ground-fault protection operation

  • Team affiliation1 Piece
  • Key featuresGFCI Outlet Tester, Cat Ii 300v, Hand Powered, false
  • Overall height5.3 L x 3.8 W x 1.5 H inches
  • Overall width5.3 L x 3.8 W x 1.5 H inches
  • Overall length5.3 L x 3.8 W x 1.5 H inches
  • Product weight1.9 oz
  • Detects common wiring faults in standard and GFCI outlets
  • Confirms GFCI ground-fault device trips correctly for safety
  • Survives a 6.6-foot drop for jobsite durability
  • Operates from 32 to 140 °F across work environments
  • Tests 110/125 V AC 50/60 Hz three-wire receptacles

Klein Tools RT210 GFCI Outlet Tester

The Klein Tools RT210 tests standard and GFCI North American 110/125V AC receptacles. It identifies common wiring faults such as open ground, reverse polarity, open hot, open neutral and hot/ground reversed. Electricians, inspectors and homeowners use it to verify outlet safety before connecting equipment.

Plug-in operation with drop-rated durability

Insert the tester directly into a three-wire outlet; the indicator lights display the wiring condition using the chart on the housing. No batteries or external power are required. The unit withstands a 6.6-foot drop and operates from 32 to 140 degrees Fahrenheit, so it survives typical job-site handling.

Limited to 125 V AC CAT II 300 V environments

The tester works only on 50/60 Hz circuits up to 125 V AC and is rated CAT II 300 V. It cannot evaluate higher-voltage, three-phase or DC systems. It confirms GFCI trip function but does not measure loop impedance, leakage current or insulation resistance. Buyers needing those measurements require dedicated test instruments.

How it compares

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

Price $24.99
Cheaper than about 63% of the 971 comparable items (median $30.99).

Specifications

Product
Brand nameKLEIN TOOLS, Klein Tools
Size & build
Overall height5.3 L x 3.8 W x 1.5 H inches
Overall width5.3 L x 3.8 W x 1.5 H inches
Overall length5.3 L x 3.8 W x 1.5 H inches
Product weight1.9 oz
More details
Team affiliation1 Piece

Questions about this item

How can I confirm the RT210 is working correctly after plugging it into an outlet?

Observe the three indicator lights and compare their pattern to the chart printed on the tester; it identifies conditions such as open ground, reverse polarity, open hot, open neutral, and hot/ground reversed.

What comes with the RT210 and do I need to buy anything else to use it?

The package contains the single hand‑powered tester itself; no batteries, leads, or adapters are required for testing standard or GFCI 3‑wire outlets.

Which version of the RT210 should I choose for 110/125 V AC circuits at 50/60 Hz?

The RT210 is a single model rated CAT II 300 V for 110/125 V AC at 50/60 Hz, so there are no alternative versions or capacities to select from.

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