Brake Fluid Tester Pen – 5 LED Oil Quality Indicator

Keep your vehicle's braking system in top condition with this Brake Fluid Tester Pen. Using advanced conductivity sensing, it instantly measures the moisture content of your brake fluid and displays results via five color-coded LED indicators — giving you fast, accurate readings without the guesswork.

Made in Mainland China.

Why Monitor Your Brake Fluid?

Brake fluid naturally absorbs moisture over time. High water content lowers the fluid's boiling point, which can reduce braking efficiency. This compact tester lets you check fluid condition in seconds — right at home or in the shop — so you always know when it's time for a change.

Key Features

• 5 LED Display: Five clearly visible LEDs show exact water-content percentage levels (0%, 1%, 2%, 3%, 4%) for more accurate, easy-to-read results
• Color-Coded Results: Green = fluid in good condition | Yellow = change approaching | Red = fluid must be replaced immediately
• High-Precision Probe: Crafted from precision-grade materials for consistent, reliable readings every time
• Durable Build: Black surface-treated finish is rust-proof, wear-resistant, and built to last
• Anti-Slip Frosted Grip: Comfortable, non-slip texture for secure, confident handling
• Cable-Free Design: No wires or connectors needed — simply press, dip, and read
• Simple One-Button Operation: Press the switch to power on; green LED confirms battery is good

LED Water Content Guide

• 0% LED: No measurable water content — fluid is excellent
• 1% LED (H₂O ≤ 1%): Fluid is above standard — no action needed
• 2% LED (H₂O ≤ 2%): Fluid still usable — monitor regularly
• 3% LED (H₂O ≤ 3%): Replacement recommended soon
• 4% LED (H₂O ≥ 4%): Fluid must be replaced immediately

How to Use

1. Install a 1.5V AAA battery (not included)
2. Press the power switch — green LED confirms battery status
3. Insert the probe tip into the brake fluid reservoir
4. Read the LED display to determine fluid condition
5. After use, wipe the probe clean with a dry cloth or paper towel to prolong its life

What's in the Box

• 1× Brake Fluid Tester Pen (1.5V AAA battery not included)

You May Also Like

• Car Molding Trim Tape – Decorative Auto Adhesive Strip
• Tactical EDC Bag – Portable Tool Storage Handbag

Learn more: FuelEconomy.gov on vehicle maintenance

Frequently Asked Questions

Q: What type of brake fluid does this tester work with?

A: The brake fluid tester is compatible with common glycol-based brake fluids including DOT 3, DOT 4, and DOT 5.1. It works by measuring the conductivity change caused by moisture absorption in the fluid.

Q: Do I need any special skills to use the brake fluid tester pen?

A: Not at all! Simply insert a 1.5V AAA battery, press the power button, dip the probe into your brake fluid reservoir, and read the 5-LED display. No automotive experience is required.

Q: Is the battery included with the tester?

A: The 1.5V AAA battery is not included due to international shipping restrictions. A standard AAA battery available at most stores is all you need to get started.

Q: How do I know when to replace the battery in the tester itself?

A: When you press the power switch, a green LED will light up to confirm the battery is working properly. If the green light does not turn on, it's time to replace the battery in the pen.

Production & Packaging Notice

To maintain high stock availability and fast shipping times, our items are sourced from multiple verified manufacturing facilities. While the core quality, materials, and product specifications remain identical, you may notice slight variations in the packaging design, manufacturing origin, or the wording of the printed instructions.