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