🛠️Battery Tester Car Brake Fluid Tester For Dot3/DOT4 Battery Liquid Digital

🛠️Brake Fluid Tester (DOT3/DOT4 Universal) 

Compact Brake Fluid Tester Pen

This compact brake fluid tester pen measures electrical conductivity to quickly detect water content in vehicle brake fluid. Clear LED indicator lights show whether your brake fluid is safe for continued use or requires replacement. Ideal for DIY vehicle owners and professional technicians alike, it helps prevent hazardous brake malfunctions.

Features

✅ Precise 5-LED Indicator System

Five colored LED lights clearly display the percentage of water present in brake fluid. Green lights signal good brake fluid condition; yellow lights indicate a 1–3% water content, with replacement recommended at your next inspection; red lights mean water content exceeds 3%, requiring immediate brake fluid replacement. It accurately identifies boiling point fluctuations caused by moisture to avoid degraded braking performance.

✅ Wide Compatibility

This moisture tester is fully compatible with DOT 3, DOT 4 and DOT 5.1 standard brake fluids. Suitable for daily passenger vehicles and workshop fleets, it serves both household routine maintenance and professional repair work.

✅ Ultra-Simple Single-Button Operation

Simply press the power button, submerge the metal probe into the brake fluid reservoir for 1 second, and instant test results will appear. Press the button again for manual power-off; to conserve battery life, the tester automatically shuts down after 15 seconds of inactivity.

✅ Pocket-Sized Portable Design

Shaped like a pen with a side clip, this tool easily fits into jeans pockets or tool bags. It runs on one 1.5V AAA battery (battery not included) for convenient preparation.

❤️ Safe Driving Reminder

Excess moisture lowers the boiling point of brake fluid, creating a risk of brake failure. This detector identifies potential hazards at an early stage. Timely brake fluid replacement safeguards the safety of you and your passengers.