HABOTEST HT5009 Digital Brake Fluid Tester DOT3/DOT4/DOT5.1

Keep your vehicle's braking system performing at its best with the HABOTEST HT5009 Digital Brake Fluid Tester. This portable, professional-grade tool measures moisture content in DOT3, DOT4, and DOT5.1 brake fluids with high precision — giving you instant, accurate readings so you know exactly when a fluid change is due. Made in Mainland China.

Why Monitor Your Brake Fluid?

Brake fluid is hygroscopic — it naturally absorbs moisture over time. Excess moisture lowers the fluid's boiling point, which can reduce braking effectiveness under heavy use. The HT5009 detects moisture levels from 0% to 4% with ±0.3% accuracy, helping you stay ahead of maintenance before it becomes a costly issue.

Key Features

• High-Sensitivity Flexible Probe: A flexible metal hose lets you easily access tight reservoir openings without spills or mess.
• Multi-Fluid Compatibility: Tests DOT3, DOT4, and DOT5.1 brake fluids — covers the vast majority of passenger and light commercial vehicles.
• 3-Color Backlit LCD Display: At-a-glance color-coded status (good / check / replace) makes interpreting results fast and straightforward.
• Audio-Visual Alarm: Built-in buzzer and light alert notify you when moisture levels exceed safe thresholds.
• Built-in Flashlight: Illuminates dark engine bays for convenient under-hood use.
• Data Hold Function: Freezes the reading on screen so you can note the result without keeping the probe submerged.
• Calibratable: Field-calibration capability ensures long-term measurement reliability.
• Auto Power Off & Low Battery Indicator: Conserves battery life and alerts you before power runs out.
• Lightweight & Portable: At just ~95.5 g and 340 × 45 × 28 mm, it slips easily into a toolbox or glovebox.

Specifications

What's in the Box

• 1 × HABOTEST HT5009 Brake Fluid Tester
• 1 × User Manual
• Note: AAA batteries are NOT included.

How to Use

1. Ensure the metal probe is clean and dry before use.
2. Fully immerse the metal detection head into the brake fluid reservoir for at least 3 seconds.
3. Wait for the display reading to stabilize, then record the result.
4. After testing, clean the probe thoroughly to avoid cross-contamination before testing another fluid type.

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Frequently Asked Questions

Q: Which brake fluid types does the HABOTEST HT5009 brake fluid tester support?

A: The HT5009 is compatible with DOT3, DOT4, and DOT5.1 brake fluids — the three most common types found in passenger cars, SUVs, trucks, and light commercial vehicles. It is not designed for DOT5 silicone-based fluid.

Q: What does the moisture percentage reading mean, and when should I change my brake fluid?

A: The tester measures the water content dissolved in your brake fluid (0%–4%). Most manufacturers recommend changing the fluid when moisture content approaches or exceeds 3%. The HT5009's 3-color backlit display and audio alarm make it easy to know when action is needed — green typically indicates good condition, yellow suggests monitoring, and red signals a fluid change is advisable.

Q: Do I need to buy batteries separately?

A: Yes. The HT5009 requires 2 × 1.5V AAA batteries, which are not included in the package. Standard AAA alkaline batteries available at any hardware or convenience store will work perfectly.

Q: How do I keep the probe accurate over time?

A: Always clean the metal probe after each use to prevent corrosion, oxidation, or fluid residue build-up, as any of these can affect reading accuracy. The HT5009 also supports field calibration so you can recalibrate the unit as needed to maintain measurement precision.