---
product_id: 13752551
title: "Gunson G4125 Gastester Digital"
brand: "gunson"
price: "1426.51 DT"
currency: TND
in_stock: true
reviews_count: 13
category: "Gunson"
url: https://www.desertcart.tn/products/13752551-gunson-g4125-gastester-digital
store_origin: TN
region: Tunisia
---

# No filters to replace 0.5% CO accuracy No moving parts, zero wear Gunson G4125 Gastester Digital

**Brand:** gunson
**Price:** 1426.51 DT
**Availability:** ✅ In Stock

## Summary

> 🛠️ Tune Like a Pro, Drive Like a Legend

## Quick Answers

- **What is this?** Gunson G4125 Gastester Digital by gunson
- **How much does it cost?** 1426.51 DT with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.tn](https://www.desertcart.tn/products/13752551-gunson-g4125-gastester-digital)

## Best For

- gunson enthusiasts

## Why This Product

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

## Key Features

- • **Built to Last:** No moving parts means zero mechanical wear and long-lasting reliability.
- • **Effortless Calibration:** Calibrates easily in air, so you’re always ready to optimize performance.
- • **Precision You Can Trust:** Accurate CO measurement within 0.5% for flawless carburettor tuning.
- • **Maintenance-Free Operation:** Forget filter changes—designed for hassle-free, continuous use.
- • **British Engineering Excellence:** Proudly manufactured in the UK with decades of automotive expertise.

## Overview

The Gunson G4125 Gastester Digital is a precision gas analyzer designed for accurate carburettor and petrol injection system tuning. Featuring 0.5% CO measurement accuracy, no moving parts, and filter-free operation, it offers durable, maintenance-free performance. Calibrated easily in air, this British-engineered tool is trusted by classic vehicle technicians for reliable, professional-grade results.

## Description

Gastester is used for the testing and setting of all carburettors (petrol, leaded or unleaded) and petrol injection systems on any vehicle.Gastester provides a simple and inexpensive method of showing when the correct petrol/air mixture is being dispensed A British tool company based in Warwickshire, United Kingdom. Gunson Tools draws on years of experience to introduce quality products which offer real value for money. All our products are responsibly sourced both from trusted ethical partners across the world PLUS (uniquely as an automotive tool brand) our own manufacturing base in the UK. Trusted quality products like Eezi-Bleed, ColourTune, Carbalancer and Eezi-lap are just a few names within the range. Combining our British manufacturing, our years of experience and vast expertise in the automotive sector helps us achieve our aim of bringing high quality tool solutions first to market and being No.1 choice for the Classic vehicle technician

## Features

- Content includes: Gas tester instrument including
- Calibrates in air, no moving parts to wear out
- No filters to change
- Accurate to 0.5% C.O measurement at 15-25˚C
- Easy to follow instructions

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B002XF1VW6 |
| Best Sellers Rank | #568,836 in Automotive ( See Top 100 in Automotive ) #6 in Gas Analyzers |
| Brand | GUNSON |
| Customer Reviews | 4.0 4.0 out of 5 stars (301) |
| Date First Available | August 16, 2012 |
| Is Discontinued By Manufacturer | No |
| Item Weight | 1.1 pounds |
| Item model number | G4125 |
| Manufacturer | Tool Connection (EU) |
| Manufacturer Part Number | LASG4125 |
| Model | G4125 |
| Product Dimensions | 5.24 x 9.65 x 7.2 inches |

## Images

![Gunson G4125 Gastester Digital - Image 1](https://m.media-amazon.com/images/I/71Bthmee96L.jpg)

## Questions & Answers

**Q: What gases does it test? 02, HC, ???**
A: This reads O2 only. Thanks Ben

**Q: How many/ which gases does this tool measure?**
A: Has anyone actually used this, and does it perform well enough to go by its measurements before smog so I can tune and then smog same day if possible????

**Q: Can it meassure HCppm, CO%, CO2%, NOXppm? This is requirement in Mexico.**
A: No, it is strictly for CO%.Cheers!

**Q: Can this be used to test the radiator for head gasket leaks?**
A: No, measures only combustion by-product CO or Carbon Mon-oxide. Used to adust or test fuel mixture.

## Customer Reviews

### ⭐⭐⭐⭐⭐ Review
*by T***D on July 13, 2022*



### ⭐⭐⭐⭐⭐ Review
*by C***K on April 7, 2022*



### ⭐⭐⭐⭐ Review
*by F***C on April 6, 2016*



## Frequently Bought Together

- GUNSON G4125 Gastester Digital
- GUNSON G4074 Colortune Single Plug Kit 14mm

---

## Why Shop on Desertcart?

- 🛒 **Trusted by 1.3+ Million Shoppers** — Serving international shoppers since 2016
- 🌍 **Shop Globally** — Access 737+ million products across 21 categories
- 💰 **No Hidden Fees** — All customs, duties, and taxes included in the price
- 🔄 **15-Day Free Returns** — Hassle-free returns (30 days for PRO members)
- 🔒 **Secure Payments** — Trusted payment options with buyer protection
- ⭐ **TrustPilot Rated 4.5/5** — Based on 8,000+ happy customer reviews

**Shop now:** [https://www.desertcart.tn/products/13752551-gunson-g4125-gastester-digital](https://www.desertcart.tn/products/13752551-gunson-g4125-gastester-digital)

---

*Product available on Desertcart Tunisia*
*Store origin: TN*
*Last updated: 2026-07-04*