Ensure safe braking performance with this Automotive Brake Fluid Tester Pen, designed to quickly and accurately assess the water content in your vehicle’s brake fluid. Featuring a built-in LED indicator system, this compact tool provides instant readings to help prevent brake failure caused by contaminated or degraded fluid. Suitable for most DOT3, DOT4, and DOT5.1 brake fluids, it’s an essential diagnostic tool for DIY mechanics and professional technicians alike.

Compact, easy to use, and highly reliable—perfect for routine brake system maintenance.

Key Features

• Detects water content in brake fluid in seconds

• LED light indicators show brake fluid condition clearly (0%–>4%)

• Compatible with most DOT3, DOT4, and DOT5.1 brake fluids

• Helps prevent brake failure due to moisture contamination

• One-button operation for quick, hassle-free testing

• Compact pen-style design fits easily in pockets or toolboxes

• Ideal for garages, auto repair shops, and personal vehicle checks

Specifications

• Display: 5 LED indicators (Green to Red)

• Compatibility: DOT3, DOT4, DOT5.1 brake fluids

• Power Supply: 1 x AAA battery (not always included)

• Material: ABS plastic + metal probe

• Function: Brake fluid moisture detection

• Response Time: Instant (<2 seconds)

• Usage: Cars, motorcycles, trucks, and other hydraulic brake systems

Protect your braking system with confidence using this LED Brake Fluid Tester Pen—a simple yet powerful tool for safe driving and vehicle care.