---
product_id: 135329793
title: "Brake Fluid Tester Pen, Hydraulic Fluid Liquid Oil Moisture Analyzer with 5 LED Indicators, Auto Brake Diagnostic Testing Tool for DOT3 DOT4 Brake Fluid"
brand: "eoutil"
price: "$19.32"
currency: USD
in_stock: true
url: https://www.desertcart.us/products/135329793-brake-fluid-tester-pen-hydraulic-fluid-liquid-oil-moisture-analyzer
store_origin: US
region: United States of America
---

# 6.6 x 1.5 x 1.5 in Size 1.5V Power 1.58 oz Weight Brake Fluid Tester Pen, Hydraulic Fluid Liquid Oil Moisture Analyzer with 5 LED Indicators, Auto Brake Diagnostic Testing Tool for DOT3 DOT4 Brake Fluid

**Brand:** eoutil
**Price:** $19.32
**Availability:** ✅ In Stock

## Summary

> 🚗 Drive with Confidence: Your Brake Fluid's Best Friend!

## Quick Answers

- **What is this?** Brake Fluid Tester Pen, Hydraulic Fluid Liquid Oil Moisture Analyzer with 5 LED Indicators, Auto Brake Diagnostic Testing Tool for DOT3 DOT4 Brake Fluid by eoutil
- **How much does it cost?** $19.32 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.us](https://www.desertcart.us/products/135329793-brake-fluid-tester-pen-hydraulic-fluid-liquid-oil-moisture-analyzer)

## Best For

- eoutil enthusiasts

## Why This Product

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

## Key Features

- • **Safety First!:** Ensure your brake fluid is in top shape for safer drives.
- • **User-Friendly!:** Designed for beginners, check fluid quality in seconds.
- • **Instant Readings!:** 5 LED indicators for quick moisture level checks.
- • **Compact & Durable!:** Lightweight design with a robust ABS shell.
- • **Smart Power Saver!:** Auto shut-off feature to conserve battery life.

## Overview

The eOUTIL Brake Fluid Tester Pen is a compact and durable tool designed to analyze the moisture content in DOT3, DOT4, and DOT5 brake fluids. With five LED indicators for easy reading, this user-friendly device ensures your vehicle's brake system is safe and reliable. Its lightweight design and automatic shut-off feature make it a must-have for every car owner.

## Description

Brake Fluid Tester Pen, Hydraulic Fluid Liquid Oil Moisture Analyzer with 5 LED Indicators, Auto Brake Diagnostic Testing Tool for DOT3 DOT4 Brake Fluid

## Features

- SAFE&USEFUL---The unit is Mini Pen Liquid Moisture Water Tester Tool. Check the health status of DOT3, DOT4, DOT5 car brake fluid, it will be safer for your driving.
- 5 LED INDICATORS---5 LED to indicate percentage of water in the brake fluid with three colors green yellow and red. Even in the dark does not affect reading, make reading data easier.
- EASY TO USE---The brake fluid tester is easy to use. Check the quality of brake fluid in car only takes seconds. Make it easier to operate for beginner. It's a must-have car tool for your car owners.
- PORTABLE&DURABLE---Brake fluid tester pen is small compact size, easy to carry. Super strong ABS shell, has long service life.
- AUTO TURN OFF---In order to save power, this test pen has the automatic shutdown function, it will automatically turn off the power 15 seconds after starting every time.

## Technical Specifications

| Specification | Value |
|---------------|-------|
| Manufacturer | eOUTIL |
| Brand | eOUTIL |
| Item Weight | 1.58 ounces |
| Package Dimensions | 6.6 x 1.5 x 1.5 inches |
| Manufacturer Part Number | BFT034BL300-LW-ca03 |
| Voltage | 1.5 Volts |

## Images

![Brake Fluid Tester Pen, Hydraulic Fluid Liquid Oil Moisture Analyzer with 5 LED Indicators, Auto Brake Diagnostic Testing Tool for DOT3 DOT4 Brake Fluid - Image 1](https://m.media-amazon.com/images/I/51Lvrzs5hZL.jpg)

## Available Options

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

## Questions & Answers

**Q: Does it work for DOT 5 ?**
A: dot 5 is silicone based & dot 5.1 will hold moisture. this product detects moisture content

**Q: What is the difference between this model for $8.91 and the $6.99 model, bft034bl300-lw-03?**
A: can't tell you the difference , only that the one I bought fell apart .

**Q: Does the brake fluid 
tester work with Dot 3 and 4 fluid?**
A: According to the listing for the item, it does. I only used mine on DOT 3 so I don't know for sure. My guess would be that the only one it wouldn't work on is DOT 5/SIlicone brake fluid

**Q: Does it check power steering fluid or antifreeze coolsnt**
A: It Only check brake fluid

## Frequently Bought Together

- eOUTIL Brake Fluid Tester Pen, Hydraulic Fluid Liquid Oil Moisture Analyzer with 5 LED Indicators, Auto Brake Diagnostic Testing Tool for DOT3 DOT4 Brake Fluid
- GODESON 88702 Smart Color Coded Tire Tread Depth Gauge

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*Product available on Desertcart United States of America*
*Store origin: US*
*Last updated: 2026-05-17*