---
product_id: 3246886
title: "Thexton THE404 Spark Tester"
brand: "thexton"
price: "€ 32.98"
currency: EUR
in_stock: true
reviews_count: 8
category: "Thexton"
url: https://www.desertcart.hr/products/3246886-thexton-the404-spark-tester
store_origin: HR
region: Croatia
---

# Visible spark gap for precise testing 7.4-inch compact size Strong alligator clip for secure grounding Thexton THE404 Spark Tester

**Brand:** thexton
**Price:** € 32.98
**Availability:** ✅ In Stock

## Summary

> ⚡ Ignite your diagnostic game with Thexton THE404 – where precision meets power!

## Quick Answers

- **What is this?** Thexton THE404 Spark Tester by thexton
- **How much does it cost?** € 32.98 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.hr](https://www.desertcart.hr/products/3246886-thexton-the404-spark-tester)

## Best For

- thexton enthusiasts

## Why This Product

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

## Key Features

- • **Trusted by Pros:** Highly rated and recommended for mechanics to diagnose misfires and ignition faults quickly.
- • **Reliable Grounding:** Heavy-duty alligator clip ensures stable connection to engine blocks or mounts for flawless testing.
- • **Instant Visual Feedback:** Clear spark visibility through glass tube makes recording and photo documentation effortless.
- • **Compact & Durable Design:** Rugged glass tube and spark plug-sized form factor fit seamlessly in any mechanic’s toolkit.
- • **Precision Spark Diagnostics:** Adjustable spark gap lets you pinpoint ignition issues with professional accuracy.

## Overview

Thexton THE404 Spark Tester is a compact, durable automotive diagnostic tool designed to test ignition coils and spark plugs with adjustable spark gap visibility. Featuring a strong alligator clip for secure grounding and a glass tube for clear spark observation, it offers professional-grade accuracy and reliability, making it a must-have for mechanics and automotive enthusiasts alike.

## Description

Thexton THE404 Spark Tester

Review: Works - And actually it works better than my last one. The gap markings are clearly marked and was able to test coils as per warranty standards just fine. The glass tube makes the spark extremely visible for recording / photo purposes. Alligator clip is strong, I usually clip it to an ear of the engine block or alternator mount or something. No issues with grounding out the coils and is exactly what you pay for. Size is about the same as an ordinary spark plug. I have two of these in my box and haven't managed to break them yet. Definitely worth it.
Review: Great tool for misfire diagnostics! - I used these style spark plug testers at school. they are EXCELLENT! You can adjust how big you want your spark to be, which easily helps you determine if your coil packs or distributors are getting enough voltage or if your spark plug is bad. Long story short on how to use this tool: You unplug your coil/spark plug wire (depending on the type of ignition system of course) and connect it to the end of the tester that looks like the top of a spark plug. The piece that has an alligator clip just clips onto any part of the car that is metal in order to create a ground. Once it's hooked up, start your car. If you're able to get an arc going across the points in the tester, especially when it's adjusted all the way out, then you know your coils/distributor is getting plenty of voltage so it is good, and is most likely your spark plugs. If you barely get any spark, especially when the tips are almost touching then you're not getting enough voltage for some reason, which indicates a bad distributor/coil packs, or bad wiring somewhere between the coil packs/spark plug wires and the positive battery terminal. This tool is an excellent little diagnostic tool to have, and I recommend that every mechanic should own one! This is a great tool to help fix misfires and other ignition issues!

## Features

- package height : 11.988 cm
- package length : 3.378 cm
- package width : 8.483 cm
- Product type : AUTO ACCESSORY

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B0002STSBM |
| Batteries Included? | No |
| Batteries Required? | No |
| Best Sellers Rank | #55,787 in Automotive ( See Top 100 in Automotive ) #113 in Spark Plug & Ignition Tools |
| Brand | Thexton |
| Color | Neutral |
| Customer Reviews | 4.6 4.6 out of 5 stars (449) |
| Date First Available | July 7, 2004 |
| Global Trade Identification Number | 00008721004048 |
| Included Components | Thexton THE404 Spark Tester |
| Is Discontinued By Manufacturer | No |
| Item Package Quantity | 1 |
| Item Weight | 0.16 ounces |
| Item dimensions L x W x H | 7.4 x 1.1 x 5.6 inches |
| Item model number | THE404 |
| Manufacturer | Thexton |
| Measurement Accuracy | +/-0.5% |
| Measurement Type | Ohmmeter or Voltmeter |
| Part Number | THE404 |
| Power Source | Corded Electric |
| Product Dimensions | 7.4 x 1.1 x 5.6 inches |
| Size | 7.4 inches |
| Style | Electronic |
| UPC | 523161027278 522536461266 971473182121 008721004048 771395275815 055555595617 999994049174 999992232486 |
| Upper Temperature Rating | 257 Degrees Fahrenheit |
| Warranty Description | 1 Year Warranty |

## Product Details

- **Brand:** Thexton
- **Color:** Neutral
- **Item Weight:** 4.54 g
- **Power Source:** Corded Electric
- **Style:** Electronic

## Images

![Thexton THE404 Spark Tester - Image 1](https://m.media-amazon.com/images/I/41inMkG0iFL.jpg)

## Customer Reviews

### ⭐⭐⭐⭐⭐ Works
*by O***G on February 7, 2025*

And actually it works better than my last one. The gap markings are clearly marked and was able to test coils as per warranty standards just fine. The glass tube makes the spark extremely visible for recording / photo purposes. Alligator clip is strong, I usually clip it to an ear of the engine block or alternator mount or something. No issues with grounding out the coils and is exactly what you pay for. Size is about the same as an ordinary spark plug. I have two of these in my box and haven't managed to break them yet. Definitely worth it.

### ⭐⭐⭐⭐⭐ Great tool for misfire diagnostics!
*by J***Y on December 9, 2014*

I used these style spark plug testers at school. they are EXCELLENT! You can adjust how big you want your spark to be, which easily helps you determine if your coil packs or distributors are getting enough voltage or if your spark plug is bad. Long story short on how to use this tool: You unplug your coil/spark plug wire (depending on the type of ignition system of course) and connect it to the end of the tester that looks like the top of a spark plug. The piece that has an alligator clip just clips onto any part of the car that is metal in order to create a ground. Once it's hooked up, start your car. If you're able to get an arc going across the points in the tester, especially when it's adjusted all the way out, then you know your coils/distributor is getting plenty of voltage so it is good, and is most likely your spark plugs. If you barely get any spark, especially when the tips are almost touching then you're not getting enough voltage for some reason, which indicates a bad distributor/coil packs, or bad wiring somewhere between the coil packs/spark plug wires and the positive battery terminal. This tool is an excellent little diagnostic tool to have, and I recommend that every mechanic should own one! This is a great tool to help fix misfires and other ignition issues!

### ⭐⭐⭐⭐ Love nostalgic tools
*by N***O on December 28, 2025*

A must have for every garage

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*Product available on Desertcart Croatia*
*Store origin: HR*
*Last updated: 2026-01-29*