Gardner Bender 2-Piece Electrical Tester Kit

The Gardner Bender GTK-2 kit combines two essential electrical testing tools — a non-contact voltage tester and a GFCI outlet tester. It’s positioned as safety equipment for contractors who need basic electrical diagnostics without investing in premium test gear.

The kit handles 50V-600V AC detection with a CAT III 600V safety rating. That covers everything from residential 120V circuits to commercial 480V panels. For Montana contractors dealing with agricultural buildings, shop wiring, and residential service calls, these voltage ranges handle 99% of what they’ll encounter. Both visual and audible alerts mean you’ll know when voltage is present even in bright sunlight or noisy job sites.

Core Testing Capabilities

The non-contact voltage tester (model GVD-3504) detects AC voltage from 50V to 600V without making direct contact with conductors. It provides both flashing LED and beeping tone indicators, critical when working in cramped electrical panels where you can’t always see the tip clearly. The fully insulated probe tip and built-in safe-test battery check address two common field failures — exposed probe tips that create shock hazards and dead batteries discovered at the worst possible moment.

The GFCI outlet tester (model GFI-3501) operates on standard 110V-125V outlets and trips GFCI protection at 6-9mA. It tests seven wiring conditions: open ground, open neutral, open hot, hot/ground reverse, hot/neutral reverse, ground-fault interruption, and correct wiring. Yellow and red neon indicator lights provide clear visual status — no interpretation charts needed.

Technical Specifications

Specification	Value
AC Voltage Range	50V - 600V
Outlet Test Voltage	110V - 125V
Safety Rating	CAT III 600V
GFCI Trip Range	6-9mA
Drop Rating	6 ft (1.8 m)
Crush Rating	150 lb (68 kg)
Power Source	1 x AAA battery (not supplied)
Package Dimensions	8.75” H x 5.25” W x 1” D

Durability for Job Site Reality

The 6-foot drop rating and 150-pound crush rating mean these testers survive typical job site abuse. That’s ladder height for the drop test and about what happens when someone steps on a tool bag. The cons identified in reviews — high NCVT sensitivity and lighter plastic build quality — tell the real story. These aren’t Klein or Fluke instruments. They’re budget testers that get the job done.

The compact size with integrated pocket clips matters for service electricians covering Montana’s vast territories. Less bulk in the tool bag when you’re driving from Eureka to Libby for a service call. Single AAA battery operation keeps operating costs minimal, though reviews note batteries aren’t always included.

Montana-Specific Applications

GFCI protection is mandatory for Montana garages, outdoor outlets, and anywhere within 6 feet of water sources. The GFCI tester’s ability to verify proper function at 6-9mA trip levels ensures code compliance. Temperature swings from -30°F to 100°F put stress on GFCI components — regular testing catches failures before they become safety hazards.

The non-contact tester’s 50V starting range picks up induced voltage and parasitic loads that can shock unsuspecting homeowners. Critical for troubleshooting why that “dead” circuit still tingles when touched. The CAT III 600V rating covers agricultural 3-phase installations common in Mission Valley irrigation systems and grain elevator operations around Great Falls.

Gardner Bender targets the contractor who needs functional test equipment. With over 60 years manufacturing electrical products, they understand what works in the field. This kit won’t replace a contractor’s primary test equipment, but it makes sense as truck stock, apprentice gear, or backup testers scattered across multiple service vehicles.

Frequently Asked Questions

What’s actually included in the GTK-2 kit? The kit includes two testers: a non-contact voltage tester (Circuit Alert model GVD-3504) for 50V-600V AC detection and a GFCI outlet tester (model GFI-3501) for 110V-125V outlets. No batteries included — you’ll need one AAA battery for the voltage tester.

How sensitive is the non-contact voltage detection? Reviews indicate the NCVT sensitivity can be higher than Klein testers. This means more false positives from induced voltage but also better detection of low-level parasitic voltage that could still deliver a shock.

Can this test 240V outlets like dryer and range receptacles? No. The GFCI tester only works on 110V-125V outlets. You’ll need a different tester for 240V receptacle verification.

How accurate is the GFCI trip test function? The tester trips GFCI devices at 6-9mA, which falls within the 4-6mA UL requirement for Class A GFCI devices. This verifies the GFCI will trip before dangerous current levels.

What do the LED patterns mean on the outlet tester? The tester uses yellow and red neon indicators to show seven conditions. It identifies open ground, open neutral, open hot, hot/ground reverse, hot/neutral reverse, correct wiring, and GFCI function. The LED pattern for each condition is printed on the tester housing.