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Innova 3420 Smart Test Light with transparent handle showing LEDs, cigarette lighter plug and alligator clamps

Innova 3420 Smart Test Light Circuit Tester

SKU CH-MTND-HR14T

A corded circuit tester with LED indicators for voltage, ground and connection status, six-foot leads and an ergonomic grip

  • Team affiliation1 Piece
  • Key featuresSmart Test Light, Corded Electric, false
  • Overall height6.5 L x 1.75 W x 10.25 H inches
  • Overall width6.5 L x 1.75 W x 10.25 H inches
  • Overall length6.5 L x 1.75 W x 10.25 H inches
  • Product weight0.5 lb (0.23 kg)
  • Safely checks voltage and ground on multiple electronic systems
  • Transparent handle LEDs show white for source, red for voltage, green for ground
  • Connects via cigarette lighter plug and detachable twin alligator clamps
  • Six-foot leads give long reach for flexible testing
  • Ergonomic grip design adds comfort and safety during use

Automotive Circuit Tester 3420

The Innova 3420 is a corded smart test light designed to check voltage and ground on vehicle electronic systems. It connects through a cigarette lighter plug and detachable twin alligator clamps. A transparent handle displays white, red and green LEDs to confirm source connection, voltage presence and ground presence. The six-foot leads give extended reach around the engine bay.

Technicians Needing Visual Polarity Checks

This tool suits mechanics who want immediate LED indication of circuit status while probing wiring harnesses. The ergonomic grip supports comfort during extended diagnostic sessions. Builders who need numerical voltage readings or data logging should look at a digital multimeter instead. Users requiring wireless operation or battery-powered portability will not find those features here.

Six-Foot Lead Length

The 6.5 L x 1.75 W x 10.25 H inch tester weighs .5 pounds and ships as a single piece. Its fixed six-foot cords set the maximum working distance from the power source. Verify that this reach covers the circuits you plan to test before purchasing.

How it compares

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

Price $44.99
Pricier than about 69% of the 971 comparable items (median $30.99).

Specifications

Product
Brand nameInnova
Product typeVoltmeter
Size & build
Overall height6.5 L x 1.75 W x 10.25 H inches
Overall width6.5 L x 1.75 W x 10.25 H inches
Overall length6.5 L x 1.75 W x 10.25 H inches
Product weight0.5 lb (0.23 kg)
More details
Team affiliation1 Piece

Questions about this item

How do I know if the 3420 Smart Test Light is the right circuit tester for my automotive electrical work?

The 3420 is designed to safely check voltage and ground on multiple electronic systems using a cigarette lighter plug or detachable twin alligator clamps with six-foot leads for long reach.

What do the LED colours in the transparent handle tell me when I am testing a circuit?

White indicates a proper connection to the power source, red shows voltage is present, and green confirms a ground connection is present.

How does the corded electric connection affect where I can use this tester around the vehicle?

The six-foot leads on both the cigarette lighter plug and the alligator clamps give you extended reach without relying on batteries.

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