---
product_id: 639628366
title: "Brake Fluid Liquid Tester Pen, DOT 3 DOT 4 DOT 5.1 Brake Diagnostic Testing Pen Tool, Brake Fluid Liquid Oil Analyzer with 5 LED Indicators, Universal Car Accessories"
brand: "gasedin"
price: "€ 12.68"
currency: EUR
in_stock: true
reviews_count: 8
category: "Gasedin"
url: https://www.desertcart.hr/products/639628366-brake-fluid-liquid-tester-pen-dot-3-dot-4-dot
store_origin: HR
region: Croatia
---

# 5-level LED moisture detection AAA battery powered (not included) Durable brass metal body Brake Fluid Liquid Tester Pen, DOT 3 DOT 4 DOT 5.1 Brake Diagnostic Testing Pen Tool, Brake Fluid Liquid Oil Analyzer with 5 LED Indicators, Universal Car Accessories

**Brand:** gasedin
**Price:** € 12.68
**Availability:** ✅ In Stock

## Summary

> 💡 Don’t brake your streak—test your brake fluid like a pro!

## Quick Answers

- **What is this?** Brake Fluid Liquid Tester Pen, DOT 3 DOT 4 DOT 5.1 Brake Diagnostic Testing Pen Tool, Brake Fluid Liquid Oil Analyzer with 5 LED Indicators, Universal Car Accessories by gasedin
- **How much does it cost?** € 12.68 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/639628366-brake-fluid-liquid-tester-pen-dot-3-dot-4-dot)

## Best For

- gasedin enthusiasts

## Why This Product

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

## Key Features

- • **Clear LED Alerts:** 5 LED indicators signal fluid condition—green for good, yellow for caution, red for immediate change.
- • **Universal Compatibility:** Works seamlessly with DOT 3, DOT 4, and DOT 5.1 brake fluids for all your vehicles.
- • **Durable & Ergonomic Design:** Premium brass construction with anti-slip frosted casing for long-lasting, confident use.
- • **Instant Brake Fluid Health Check:** Get real-time moisture readings with a simple dip and button press.
- • **Prevent Costly Repairs & Accidents:** Stay ahead of brake corrosion and system damage by knowing exactly when to replace fluid.

## Overview

The Gasedin Brake Fluid Liquid Tester Pen is a precision diagnostic tool designed to measure moisture content in DOT 3, DOT 4, and DOT 5.1 brake fluids. Featuring 5 LED indicators for clear condition alerts and a durable brass body with an anti-slip grip, it empowers vehicle owners to proactively maintain brake system health and avoid costly repairs or safety risks. Powered by a single AAA battery (not included), this compact pen offers quick, reliable testing with professional-grade accuracy.

## Description

desertcart.com: Gasedin Brake Fluid Liquid Tester Pen, DOT 3 DOT 4 DOT 5.1 Brake Diagnostic Testing Pen Tool, Brake Fluid Liquid Oil Analyzer with 5 LED Indicators, Universal Car Accessories : Automotive

Review: Works great - Works as it should Battery was a little tricky to install. It's from the side , not the top. Great value.
Review: Amazing price and quality: super fast shipping - People don’t know that brake fluid, over time, attracts and suspends water. It’s corrosive and not good. This device measures amt of water contained in the system by simply dipping it in the reservoir and pushing a button. You’ll need to supply 1 AAA or you’ll get no lights at all. So as the top of the brake fluid reseviours now mostly non- sealed they will zap up moisture. Pressing the brakes pushes pistons to pressurize fluid and expand brake pads or rotor/caliper piston and if there’s water in the reseviour it will be pumped into the brake system to do it’s corroding & oxidation. The entire system should be bled and that is done by applying pressure at the reservoir and opening the brake bleeders at each wheel. That’s best left with professional and his/her equipment… but this tool will left you know if there’s a problem.

## Features

- 【Core Function】: This brake fluid liquid tester pen is mainly used for checking the health of your car's brake fluid, providing you with more accurate test results. What's more, it can remind you to change the brake fluid when necessary, which can effectively avoid traffic accidents.
- 【Premium Material】: Our brake fluid test pen is made of high quality degree brass metal. It has good oil resistance, which is not easy to be corroded. Therefore, it can be used for a long time. The case is frosted with a good anti-slip design, so it is not easy to fall off when you use it.
- 【Checking Function】: The water content will be indicated by the number of LED's on the test pen. A red light indicates that the brake fluid needs to be changed, a green light indicates that the brake fluid is in good condition, and a yellow light indicates that the brake fluid is in fair condition.
- 【Application Scope】: It is suitable for testing the moisture content in DOT-3, DOT-4 and DOT-5.1 brake fluid. It is compatible with AAA batteries, but please note that batteries are not included in the package. Please follow the direction of the arrow on the test pen to open the battery cover.
- 【Operating Methods】: First, unscrew the brake fluid reservoir and then pull off the brake fluid tester cap. Second, press the button for power on, green LED will light up. Third, insert the tester into reservoir for one second, then the test result will be correctly indicated by LED. Finally, repress the button for power off.

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B0D6B1HLDR |
| Best Sellers Rank | #72,309 in Automotive ( See Top 100 in Automotive ) #1,188 in Diagnostic, Test & Measurement Tools |
| Brand | Gasedin |
| Customer Reviews | 4.4 4.4 out of 5 stars (47) |
| Date First Available | June 6, 2024 |
| Item Weight | 0.704 ounces |
| Item model number | Brake Fluid Liquid Tester Pen |
| Manufacturer | Gasedin |
| Manufacturer Part Number | Gasedin-2448BF |
| Model | Brake Fluid Liquid Tester Pen |
| Package Dimensions | 8.31 x 2.05 x 0.71 inches |

## Images

![Brake Fluid Liquid Tester Pen, DOT 3 DOT 4 DOT 5.1 Brake Diagnostic Testing Pen Tool, Brake Fluid Liquid Oil Analyzer with 5 LED Indicators, Universal Car Accessories - Image 1](https://m.media-amazon.com/images/I/61Ug76VxffL.jpg)

## Customer Reviews

### ⭐⭐⭐⭐⭐ Works great
*by J***R on December 21, 2025*

Works as it should Battery was a little tricky to install. It's from the side , not the top. Great value.

### ⭐⭐⭐⭐⭐ Amazing price and quality: super fast shipping
*by M***. on September 9, 2024*

People don’t know that brake fluid, over time, attracts and suspends water. It’s corrosive and not good. This device measures amt of water contained in the system by simply dipping it in the reservoir and pushing a button. You’ll need to supply 1 AAA or you’ll get no lights at all. So as the top of the brake fluid reseviours now mostly non- sealed they will zap up moisture. Pressing the brakes pushes pistons to pressurize fluid and expand brake pads or rotor/caliper piston and if there’s water in the reseviour it will be pumped into the brake system to do it’s corroding & oxidation. The entire system should be bled and that is done by applying pressure at the reservoir and opening the brake bleeders at each wheel. That’s best left with professional and his/her equipment… but this tool will left you know if there’s a problem.

### ⭐⭐⭐⭐ Works when tested.
*by I***T on August 18, 2025*

Package says battery included. but not. Notice in picture it said battery incl. Makes you think it don’t work. Installed a 2AA battery, works when tested.

## Frequently Bought Together

- Gasedin Brake Fluid Liquid Tester Pen, DOT 3 DOT 4 DOT 5.1 Brake Diagnostic Testing Pen Tool, Brake Fluid Liquid Oil Analyzer with 5 LED Indicators, Universal Car Accessories
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*Product available on Desertcart Croatia*
*Store origin: HR*
*Last updated: 2026-02-27*