---
product_id: 2326479
title: "3420 Smart Test Light / Circuit Tester"
brand: "innova"
price: "$1242"
currency: MXN
in_stock: true
url: https://www.desertcart.mx/products/2326479-3420-smart-test-light-circuit-tester
store_origin: MX
region: Mexico
---

# Transparent handle with tri-color LED indicators 6-foot leads for extended reach Detachable twin alligator clamps for versatile connection 3420 Smart Test Light / Circuit Tester

**Brand:** innova
**Price:** $1242
**Availability:** ✅ In Stock

## Summary

> ⚡ Illuminate your diagnostics with smart precision!

## Quick Answers

- **What is this?** 3420 Smart Test Light / Circuit Tester by innova
- **How much does it cost?** $1242 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.mx](https://www.desertcart.mx/products/2326479-3420-smart-test-light-circuit-tester)

## Best For

- innova enthusiasts

## Why This Product

- Trusted innova brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Ergonomic & Safe:** Comfort grip design ensures secure handling during every diagnostic session.
- • **Plug & Play Power:** Connects effortlessly via cigarette lighter or power plug for on-the-go testing.
- • **Extended Reach, No Limits:** 6-foot leads let you access hard-to-reach circuits with ease.
- • **Instant Visual Diagnostics:** Tri-color LEDs (White, Red, Green) provide clear, immediate connection status.
- • **Versatile Clamp Connectivity:** Detachable twin alligator clamps adapt to multiple electronic systems seamlessly.

## Overview

The Innova 3420 Smart Test Light is a professional-grade circuit tester designed for quick, safe voltage and ground checks across various automotive electronic systems. Featuring a transparent handle with bright tri-color LEDs, 6-foot leads for extended reach, and detachable alligator clamps, it offers ergonomic comfort and versatile connectivity for efficient vehicle diagnostics.

## Description

3420 Smart Test Light / Circuit Tester

## Features

- Designed to safely check voltage and/or ground on several electronic systems
- Connects using a cigarette lighter / power plug and detachable twin alligator clamps
- 6-foot leads provide long reach connection
- Unique transparent handle shows bright LEDs to identify connections (White = Proper Connection to Source, Red = Voltage Present and Green = Ground Present)
- Features ergonomic grip design for comfort and safety

## Technical Specifications

| Specification | Value |
|---------------|-------|
| Brand | Innova |
| Power Source | Corded Electric |
| Style | Smart Test Light |
| Color | Clear |
| Item Weight | 8 ounces |
| Item dimensions L x W x H | 6.5 x 1.75 x 10.25 inches |
| Measurement Type | Voltmeter |
| UPC | 666669941063 521375004948 031112406015 758353141870 790725488732 042173034208 999990982482 021112418323 421730342084 043994891513 523161038885 077348890945 |
| Manufacturer | Innova |
| Global Trade Identification Number | 00042173034208 |
| Model | 3420 |
| Product Dimensions | 6.5 x 1.75 x 10.25 inches |
| Item model number | 3420 |
| Batteries | 3 AA batteries required. |
| Is Discontinued By Manufacturer | No |
| Manufacturer Part Number | 3420 |
| OEM Part Number | 3420 |

## Product Details

- **Brand:** Innova
- **Power Source:** Corded Electric
- **Style:** Smart Test Light
- **Color:** Clear
- **Item Weight:** 8 ounces

## Images

![3420 Smart Test Light / Circuit Tester - Image 1](https://m.media-amazon.com/images/I/71nO3gQZgOS.jpg)
![3420 Smart Test Light / Circuit Tester - Image 2](https://m.media-amazon.com/images/I/510Y+tvleES.jpg)
![3420 Smart Test Light / Circuit Tester - Image 3](https://m.media-amazon.com/images/I/51-cqiBSdtS.jpg)

## Available Options

This product comes in different **Style** options.

## Questions & Answers

**Q: Can tester SAFELY be used to test ECM signal going to coil and/or injector?**
A: Its current draw is supposed to be about 18mA (green) and 24mA (red), however, the product ships with the following Safety Precautions:
1. For 12V DC systems only. NOT FOR ANY AC VOLT SYSTEM.
2. DO NOT USE THIS TOOL ON COMPUTER CIRCUITRY.
3. DO NOT TEST OR PUNCTURE SPARK PLUG WIRES WITH THIS TOOL.
4. Never use a Test Light to diagnose automotive air bag...

**Q: Is this probe safe enough to test 5V automotive reference wiring? Computer safe?**
A: Hello. To be honest I’m not sure if it will pickup a 5v refurance  I use it
On 12 volt I have a power probe with the 5v connector for it. So I’m not 100 on the test ligh work on that

**Q: Is this an incandescent bulb or an LED bulb??**
A: Led

**Q: Does this tester require a connection to the car battery?**
A: Has two alligator clips to connect to a car battery and a power plug so you can plug it into the power source in the dash. Works on any 12 volt circuit. I use it to fix cars and my electric trains.

## Frequently Bought Together

- Innova 3420 Smart Test Light / Circuit Tester
- Avital 3100LX Security System (W/O Siren)
- Directed Install Essentials 451M Door-Lock Relay Assembly

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**Shop now:** [https://www.desertcart.mx/products/2326479-3420-smart-test-light-circuit-tester](https://www.desertcart.mx/products/2326479-3420-smart-test-light-circuit-tester)

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*Product available on Desertcart Mexico*
*Store origin: MX*
*Last updated: 2026-02-20*