--- product_id: 593289206 title: "AUTOOL Brake Fluid Tester, Brake Fluid Moisture Detector, DOT3 DOT4 DOT5.1 Tester with 2.8\" Backlit Display Audible Alarm for Various Brake Fluid Model" brand: "autool" price: "1218 kr" currency: DKK in_stock: true reviews_count: 5 category: "Autool" url: https://www.desertcart.dk/products/593289206-autool-brake-fluid-tester-brake-fluid-moisture-detector-dot3-dot4 store_origin: DK region: Denmark --- # 2.8" backlit display Highly sensitive sensor 180° foldable stainless steel probe AUTOOL Brake Fluid Tester, Brake Fluid Moisture Detector, DOT3 DOT4 DOT5.1 Tester with 2.8" Backlit Display Audible Alarm for Various Brake Fluid Model **Brand:** autool **Price:** 1218 kr **Availability:** ✅ In Stock ## Summary > 🚗 Stay ahead of brake failure—test smarter, drive safer! ## Quick Answers - **What is this?** AUTOOL Brake Fluid Tester, Brake Fluid Moisture Detector, DOT3 DOT4 DOT5.1 Tester with 2.8" Backlit Display Audible Alarm for Various Brake Fluid Model by autool - **How much does it cost?** 1218 kr with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.dk](https://www.desertcart.dk/products/593289206-autool-brake-fluid-tester-brake-fluid-moisture-detector-dot3-dot4) ## Best For - autool enthusiasts ## Why This Product - Trusted autool brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - • **Confidence with Coverage:** 3-year warranty plus lifetime tech support means you’re backed for the long haul. - • **Durable & Flexible Testing:** 304 stainless steel foldable probe resists oil, corrosion, and rotates 180° for perfect angles. - • **Instant Clarity, Day or Night:** Large 2.8-inch backlit screen ensures quick, clear readings anytime. - • **Precision Meets Professionalism:** Expert mode lets pros select exact brake fluid type for pinpoint accuracy. - • **Water Content Alerts You Instantly:** Audible buzzer warns when moisture exceeds safe levels—never miss a critical fluid change. ## Overview The AUTOOL AS502 Brake Fluid Tester offers rapid, precise moisture detection for DOT3, DOT4, and DOT5.1 brake fluids with a professional-grade sensor and foldable stainless steel probe. Featuring a bright 2.8-inch backlit display and audible alarms, it empowers both DIYers and mechanics to maintain brake fluid health effortlessly. Backed by a 3-year warranty and lifetime support, it’s the essential tool for proactive vehicle safety. ## Description The brake fluid tester can measure the water content of the brake fluid and determine whether the brake fluid needs to be replaced. It is designed for checking the health of DOT-3, DOT-4, DOT-5.1 brake fluids and most synthetic brake fluids. AS502 brake fluid tester is specially designed with normal mode and expert mode, and the expert mode can test different brake fluid model. It's extremly convenient for personal use and broadly applied in individual workshops and repair factories. Tips: Operation with four 1.5V batteries (not included). Note: after the completion of each test, please use the dry cloth or paper towel to wipe the fluid of the test point. Review: Probador de fluido - Exelente Review: LO RECOMIENDO - Excelente producto lo recomiendo ## Features - 【More Powerful Detection Range】Automotive Brake Fluid Detector is common fit for most vehicle. Check the health status of DOT-3, DOT-4, DOT-5.1 brake fluid and also most synthetic brake fluids. The brake fluid tester is designed with normal mode and expert mode. The expert mode is convenient for professional mechanics to select the corresponding brake fluid model for accurate testing. - 【Precision test and sensitive probe】Equipped with a highly sensitive sensor and a 260mm foldable hose, can quickly and accurately detect DOT-3, DOT-4, DOT-5.1 brake fluid and has received the result in seconds. The outer layer of the hose is made of 304 stainless steel, which has the characteristics of oil resitance, oxidation resistance, and corrosion resistance. The foldable probe can rotate 180 degree,you can choose any angle to testing. - 【Easy Instant Read】2.8 inches high resolution screen, instant display result, large display with backlight, easy and clear reading in sun or night. In addition, if the brake fluid contains too much water, the buzzer will alarm to remind you to change the brake fluid. - 【Water Content Percentage】OK icon indicates that the moisture content is between 0% and 2%. The brake fluid performance is fine; The 🔺 icon indicates a moisture content of 2% to 3%. The brake fluid performance is OK, but it need to be detected and observed in the near future; The × icon indicates that the moisture content is above 3%. The brake fluid performance is poor, it need to be replaced. - 【Three Years Warranty】For any quality problems. If AS502 has any defect, we will provide new replacement or solutions for our customers until satisfaction without delay, and provides lifetime technical support. For any needs, you are warmly welcomed to contact us and we will get back to you ASAP within 24 hours. ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B0CDLC1HJ2 | | Best Sellers Rank | #169,100 in Car & Motorbike ( See Top 100 in Car & Motorbike ) #35 in Brake Fluids | | Brand | AUTOOL | | Brand Name | AUTOOL | | Country of Origin | China | | Customer Reviews | 4.1 out of 5 stars 28 Reviews | | Included Components | coiled hose | | Item Dimensions | 28 x 17 x 7 Centimeters | | Item Weight | 0.8 Pounds | | Item dimensions L x W x H | 28 x 17 x 7 Centimeters | | Manufacturer | AUTOOL | | Material | Stainless Steel | | Material Type | Stainless Steel | | Maximum Supply Voltage | 6 Volts | | Model Number | AS502 | | Mounting Type | Flange Mount | | Output Type | digital | | Part Number | AS502 | | Smart Home Compatibility | Not Smart Home Compatible | | Specific Uses For Product | automotive, brake fluid testing | | Style | Modern | | Style Name | Modern | | Unit Count | 1 Count | | Upper Temperature Rating | 60 Degrees Celsius | ## Product Details - **Brand:** AUTOOL - **Item dimensions L x W x H:** 11.02 x 6.69 x 2.75 inches - **Material:** Stainless Steel - **Item Weight:** 0.8 Pounds - **Style:** Modern ## Images ![AUTOOL Brake Fluid Tester, Brake Fluid Moisture Detector, DOT3 DOT4 DOT5.1 Tester with 2.8" Backlit Display Audible Alarm for Various Brake Fluid Model - Image 1](https://m.media-amazon.com/images/I/61oH57ApgVL.jpg) ![AUTOOL Brake Fluid Tester, Brake Fluid Moisture Detector, DOT3 DOT4 DOT5.1 Tester with 2.8" Backlit Display Audible Alarm for Various Brake Fluid Model - Image 2](https://m.media-amazon.com/images/I/71z-iffhb4L.jpg) ![AUTOOL Brake Fluid Tester, Brake Fluid Moisture Detector, DOT3 DOT4 DOT5.1 Tester with 2.8" Backlit Display Audible Alarm for Various Brake Fluid Model - Image 3](https://m.media-amazon.com/images/I/7135HW66U8L.jpg) ![AUTOOL Brake Fluid Tester, Brake Fluid Moisture Detector, DOT3 DOT4 DOT5.1 Tester with 2.8" Backlit Display Audible Alarm for Various Brake Fluid Model - Image 4](https://m.media-amazon.com/images/I/71xIXtH7dML.jpg) ![AUTOOL Brake Fluid Tester, Brake Fluid Moisture Detector, DOT3 DOT4 DOT5.1 Tester with 2.8" Backlit Display Audible Alarm for Various Brake Fluid Model - Image 5](https://m.media-amazon.com/images/I/71zRF-AxpqL.jpg) ## Customer Reviews ### ⭐⭐⭐⭐⭐ Probador de fluido *by N***Z on 22 September 2025* Exelente ### ⭐⭐⭐⭐⭐ LO RECOMIENDO *by P***O on 1 June 2025* Excelente producto lo recomiendo ### ⭐⭐⭐⭐⭐ Great price !!! *by D***Y on 27 December 2024* Bought this for my BMW, VW, Dodge. this does all the different Fluid. --- ## Why Shop on Desertcart? - 🛒 **Trusted by 1.3+ Million Shoppers** — Serving international shoppers since 2016 - 🌍 **Shop Globally** — Access 737+ million products across 21 categories - 💰 **No Hidden Fees** — All customs, duties, and taxes included in the price - 🔄 **15-Day Free Returns** — Hassle-free returns (30 days for PRO members) - 🔒 **Secure Payments** — Trusted payment options with buyer protection - ⭐ **TrustPilot Rated 4.5/5** — Based on 8,000+ happy customer reviews **Shop now:** [https://www.desertcart.dk/products/593289206-autool-brake-fluid-tester-brake-fluid-moisture-detector-dot3-dot4](https://www.desertcart.dk/products/593289206-autool-brake-fluid-tester-brake-fluid-moisture-detector-dot3-dot4) --- *Product available on Desertcart Denmark* *Store origin: DK* *Last updated: 2026-07-30*