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Yellow plastic receptacle tester with GFCI button and indicator lights

Amprobe

Amprobe ST-102B receptacle tester GFCI 110-125V AC

SKU CH-KHHQ-0MPKZ

Tests 110-125V AC outlets for wiring faults and includes a GFCI trip function

  • TypeAssortments & Kits
  • Tests GFCI protection on 110-125V AC circuits
  • Identifies hot/ground reverse wiring faults
  • Detects open ground, hot, and neutral conditions
  • Confirms correct wiring with clear indicators
  • Includes 1-year manufacturer warranty

Amprobe ST-102B Receptacle Tester

The Amprobe ST-102B is a receptacle tester designed for verifying wiring in 110 to 125V AC outlets. It identifies correct wiring, open ground, open hot, open neutral, hot/ground reverse and hot/neutral reverse conditions. A built-in GFCI test function checks ground-fault protection. It suits electricians, inspectors and maintenance staff needing quick outlet validation.

Upgrading from basic non-GFCI testers

This unit replaces simple lamp-style testers that cannot trip or verify GFCI devices. The jump is worth it when work involves kitchens, bathrooms, garages or outdoor circuits where ground-fault protection is required. It is not for buyers who need voltage measurements, loop impedance readings or three-phase outlet testing.

Simple plug-in operation

Insert the tester directly into the receptacle; indicator lights display the wiring status instantly. The GFCI test button trips protected circuits to confirm function. Common issues include testing on dead circuits, misreading indicators in low light or assuming the tester verifies conductor gauge or insulation integrity.

Highlights

  • Tests GFCI protection on 110-125V AC circuits
  • Identifies hot/ground reverse wiring faults
  • Detects open ground, hot, and neutral conditions
  • Confirms correct wiring with clear indicators
  • Includes 1-year manufacturer warranty

Specifications

BrandAMPROBE
TypeAssortments & Kits

Questions about this item

Does the ST-102B fit a standard North American three-prong outlet?

Yes, the tester plugs directly into a standard 110 to 125 V AC three-prong receptacle without any adapter.

How do I run the GFCI test correctly on this unit?

Insert the tester fully, wait for the indicator lights to show correct wiring, then press the GFCI button once; the tester will trip a functioning GFCI device.

What should I do if the indicator lights stop working over time?

The unit has no user-serviceable parts or replaceable batteries; if the LEDs fail within the one-year manufacturer warranty period, contact the supplier for a replacement.

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