AUTOOL AS502 Brake Fluid Moisture Tester | Digital DOT3 DOT4 DOT5.1 Tester

AUTOOL AS502 Professional Brake Fluid Moisture Tester

Brake Fluid Moisture Analysis

The AUTOOL AS502 Brake Fluid Moisture Tester is a professional diagnostic tool designed to accurately measure water contamination levels in automotive brake fluid. Using advanced electrochemical sensing technology, it provides precise digital moisture readings that help identify when brake fluid requires replacement. Compatible with DOT3, DOT4 and DOT5.1 brake fluids, the AS502 delivers fast, reliable results within seconds. Its compact design, intelligent warning system and easy-to-read display make it an essential tool for workshops, fleet operators and vehicle owners focused on maintaining safe braking performance.

Main Features

Advanced Moisture Detection Technology – Utilises professional electrochemical sensing technology to accurately measure water content in brake fluid, delivering precise percentage-based readings for reliable maintenance and safety assessments.
HD Digital Display – Features a clear and easy-to-read digital screen that displays exact moisture levels, eliminating guesswork and providing greater accuracy than traditional test strips or colour-based testers.
Multi-Fluid Compatibility – Supports DOT3, DOT4 and DOT5.1 brake fluids, making it suitable for a wide range of passenger vehicles, light commercial vehicles and professional workshop applications.
Rapid Test Results – Provides fast and accurate brake fluid condition analysis within seconds, helping users quickly determine whether brake fluid replacement is necessary.
Intelligent Safety Warning System – Automatically alerts users when moisture content exceeds recommended levels, helping prevent reduced braking efficiency and supporting safer vehicle operation.
Compact & Portable Design – Lightweight and easy to carry, allowing convenient testing in workshops, garages, roadside situations and mobile service environments.
Cost-Effective Reusable Operation – Designed for repeated use without disposable test strips, helping reduce ongoing maintenance costs while delivering consistent testing performance.
Workshop & Home Garage Ready – Ideal for professional technicians, fleet maintenance operators and vehicle owners seeking dependable brake fluid diagnostics and preventative maintenance.

Package Includes

1 × AUTOOL AS502 Brake Fluid Tester
1 × User Manual

Professional Brake Fluid Moisture Testing Features

High-precision brake fluid moisture testing

Supports DOT3, DOT4 and DOT5.1 fluids

Fast digital results in seconds

Easy-to-read HD display

Intelligent moisture warning alerts

Compact and portable design

Suitable for workshop and DIY use

Reliable electrochemical sensing technology

Helps maintain braking safety

Durable construction with long service life

AUTOOL AS502 Digital Brake Fluid Moisture Tester

AUTOOL Fluid Analyzer Comparison

Comparison Table: AUTOOL AS502 Brake Fluid Tester | AUTOOL AS503 Engine Oil Quality Tester

	AUTOOL AS502	AUTOOL AS503

Detection Technology
Detection Technology	Pressure Boost Detection Technology	Optical Probe Technology
Operating Principle	Brake Fluid (Water Content)	Engine Oil (Transmittance)
Test Mode Selection	Normal Mode / Expert Mode	Gasoline Engine / Diesel Engine
Temperature Measurement Range	-	0-85°C (0-185°F)
Test Duration	10s Response	10s Response
Display & Design
Backlit Display Screen	2.8-inch	2.8-inch
Test Cable Length	26cm	80cm
Hose Material	304 Stainless Steel	Teflon
Power & Operation
Power Supply Voltage	6V	6V
Temperature Unit Switching	-	°C/°F
Normal Mode	3 Types: DOT3, DOT4, DOT5.1	-
Boiling Point Reference Value	-	-
	LEARN MORE	LEARN MORE

AUTOOL AS502 Technical Specifications

Model: AS502

Product Type: Digital Brake Fluid Moisture Tester

Detection Technology: Electrochemical Sensor

Supported Brake Fluids: DOT3, DOT4, DOT5.1

Display: HD Digital Display

Measurement Method: Moisture Percentage Reading

Warning Function: High Moisture Alert

Operating Voltage: 6V (4 × 1.5V Batteries)

Power Supply: 4 × 1.5V Batteries

Operating Temperature: -10°C to 60°C

Test Result Display: Moisture Percentage, Warning Indicators

Application: Brake Fluid Condition Testing

Housing Design: Compact & Portable

Suitable For: Automotive Workshops & Vehicle Owners

AUTOOL AS502 Professional Brake Fluid Testing Tool

Delivery

99% of purchases are dispatched from our Melbourne warehouse within 24 hours of payment. Every parcel is shipped with Australia Post e-Parcel, complete with tracking and signature on delivery.

Need it sooner? Express shipping is also available—check if your postcode is in the Next Day Delivery network.

Returns

Shop with confidence. We offer a 30-day money back guarantee on all orders. If you’ve had a change of mind, simply return the item in re-original condition and we’ll make it right.

Warranty

All AZscanners products are backed by a 12-month warranty (unless otherwise stated). We stand by the quality of our tools and will repair or replace your item if a covered fault arises.

Buying your scan tool should feel easy, safe, and backed by a team you can trust.

That’s why thousands of mechanics, fleets, and car owners across Australia choose AZscanners. Here’s our promise to you:

Trusted Since 2013

We’ve been Australia’s go-to supplier of premium diagnostic scan tools for over a decade. From workshops and mobile mechanics to DIY users, we’ve built our reputation on quality, reliability, and real support.

30-Day Money Back Guarantee

Changed your mind? No problem. You have 30 days to return your item in its original condition for a full refund. It’s our way of making your purchase completely risk-free.

Quality You Can Count On

Every product in our range is hand-picked for performance, compatibility, and durability. Whether you’re after a professional-grade scan tool or an easy solution for home use, we’ve got you covered.

Local Support that Cares

We don’t just sell scan tools — we support them. Our team of technicians is here to answer your questions before and after purchase, so you’re never left on your own.

Fast & Reliable Shipping

99% of orders are shipped within 24 hours (from our Melbourne warehouse) with tracking and signature included. Need it quicker? Express delivery is available.