AUTOOL AS501 – Mini Brake Fluid Tester (DOT3 / DOT4 / DOT5 / DOT5.1 / ENV4 / ENV6)

Overview

The AUTOOL AS501 is a compact, professional brake fluid tester that quickly and accurately detects moisture content in all major brake fluid types. Designed for workshop or mobile service use, it gives technicians a fast, clear indication of fluid quality — helping prevent brake fade and costly system failures.

Key Features

• Tests six major brake fluid types: DOT3, DOT4, DOT5, DOT5.1, ENV4, ENV6

• Digital accuracy: Pressure-boost sensor technology ensures precise readings

• Quick results: Moisture content displayed in around 10 seconds

• Flexible 260 mm stainless-steel probe reaches difficult reservoir locations

• 1.8-inch backlit display for clear visibility in low-light conditions

• Compact & lightweight – perfect for toolboxes or mobile mechanics

• Audible alarm & LED indicators warn when moisture levels exceed safe limits

• Battery powered (2× AA) for full portability

Technical Specifications

• Power Supply: 2× AA 1.5 V batteries

• Operating Temperature: -10 °C – 50 °C

• Storage Temperature: -20 °C – 60 °C

• Supported Fluids: DOT3, DOT4, DOT5, DOT5.1, ENV4, ENV6

• Probe Length: ~260 mm flexible stainless gooseneck

• Display: 1.8 – 2.8″ LCD backlit screen

• Weight: ~150 g

Ideal For

• Automotive workshops & inspection stations

• Technicians checking fluid moisture before service

• Vehicle inspection & fleet management applications

• Mobile mechanics and performance tuners

Why Choose the AUTOOL AS501

Brake fluid naturally absorbs moisture over time, lowering its boiling point and endangering braking performance. The AS501 provides a fast, reliable measurement so you can recommend fluid replacement with confidence. It’s the professional alternative to unreliable test strips — compact, fast, and precise.

In the Box

• AUTOOL AS501 main unit

• Stainless-steel gooseneck probe

• User manual

• Batteries (included in some packages)

✅ Summary

✔ Supports all major brake fluid standards
✔ 10-second moisture test
✔ HD backlit display
✔ Audible alarm warning
✔ Portable and workshop-ready