Brake Fluid Tester Pen – 5 LED DOT 3 & DOT 4 Analyzer

Know Your Brakes Are Safe Before You Drive.

Brake fluid degrades over time — and when it absorbs too much moisture, your stopping power suffers. This brake fluid tester pen gives you an instant, accurate reading of your fluid's water content in seconds, right at the reservoir. No guesswork, no expensive shop visits. Just five LEDs and the confidence to drive safely.

Why Every Driver Needs This Tool

• 🟢🟡🔴 5 LED color-coded results — instant visual reading of water content percentage
• 🚗 Compatible with DOT 3 & DOT 4 — works with the most common brake fluid types
• ⚡ Results in 1 second — dip the probes, press the button, read the result
• 🔋 Auto shut-off — powers off automatically after 15 seconds of inactivity
• 💪 Compact & pocket-sized — easy to store in your glove box or toolbox
• ✅ CE, FCC & RoHS certified — meets international safety standards
• 🔍 Conductivity-based detection — accurate measurement of moisture-induced conductivity changes

Reading the Results — 5 LEDs Explained

The brake fluid tester uses conductivity changes to measure moisture content in your fluid. Here's what each LED combination means:

• 🟢 Green only — H₂O < 1.5% — Brake fluid is in excellent condition
• 🟢🟡 Green + Yellow — H₂O ~1.5% — Good condition, retest in 6 months
• 🟢🟡🟡 Green + 2 Yellow — H₂O ~2% — Acceptable, monitor closely
• 🟢🟡🟡🔴 Green + 2 Yellow + Red — H₂O ~3% — Replace brake fluid soon
• 🟢🟡🟡🔴🔴 All 5 LEDs — H₂O > 4% — Replace immediately — dangerous condition
• 🔴 Red flashing — Battery needs replacement

Specifications

• Compatible fluids: DOT 3, DOT 4
• Indicators: 5 LEDs (Green, Yellow, Red)
• Battery: 1x AAA LR03 1.5V (not included)
• Auto shut-off: After ~15 seconds of inactivity
• Weight: ~30g
• Certifications: CE, FCC, RoHS
• Package includes: 1x brake fluid tester pen

How to Use

1. Remove the cap from the brake fluid reservoir
2. Pull off the protective cap from the tester probe
3. Dip the test probes into the brake fluid up to the plastic rim
4. Press the power button — green LED confirms battery is good
5. Hold for 1 second and read the LED result
6. Press again to power off, or let it auto shut-off
7. Rinse the probe with tap water after use

⚠️ Safety note: If brake fluid contacts skin or clothing, wash thoroughly with water. Do not leave brake fluid exposed to air for extended periods — it is highly hygroscopic.

Small Tool. Big Peace of Mind.

Imagine knowing in seconds whether your brakes are ready for the road — before a long trip, before winter, before anything. This brake fluid tester pen is the kind of tool every driver should have and almost no one does. Stock is limited — add yours to the cart today.