--- product_id: 43795227 title: "Brake Fluid Tester,HKAUS Automotive Car Testing Tool Mini Liquid Tester Auto Oil Diagnostic Pen for DOT4" brand: "hkaus" price: "€ 36.68" currency: EUR in_stock: true category: "Electronics" url: https://www.desertcart.sk/products/43795227-brake-fluid-tester-hkaus-automotive-car-testing-tool-mini-liquid store_origin: SK region: Slovakia --- # Brake Fluid Tester,HKAUS Automotive Car Testing Tool Mini Liquid Tester Auto Oil Diagnostic Pen for DOT4 **Brand:** hkaus **Price:** € 36.68 **Availability:** ✅ In Stock ## Quick Answers - **What is this?** Brake Fluid Tester,HKAUS Automotive Car Testing Tool Mini Liquid Tester Auto Oil Diagnostic Pen for DOT4 by hkaus - **How much does it cost?** € 36.68 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.sk](https://www.desertcart.sk/products/43795227-brake-fluid-tester-hkaus-automotive-car-testing-tool-mini-liquid) ## Best For - hkaus enthusiasts ## Why This Product - Trusted hkaus brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Description ❀WHAT IS IT? To be safty,knowing the car is in top condition is the most important. Checking and changing the brake fluid every 1 or 2 years is an ideal state. Our pen-shaped brake fluid tester can easily help determine whether it's time for you to change your brake fluid. ❀HOW TO USE? 1. Turn on the brake fluid tester by pressing the button. A green light should light up. If the light does not come on, it may be time to change a battery. 2. Unscrew the lid for the brake fluid reservoir, and take off the cap for the brake fluid tester. 3. Dip the test probes into the brake fluid and the LED lights will indicate the percentage of water in the brake fluid. 4. After testing, remember to screw the lid of the brake fluid reservoir back on tightly. 5. The tester will automatically power off after 12 seconds of inactivity. The LED lights will indicate the percentage of water in the brake fluid: Green: None Green/Yellow: Less than 1% Green /Yellow/Yellow: Approx. 2% Green/Yellow/Yellow/Red: Approx. 3% (Time to change brake fluid.) Green/Yellow/Yellow/Red/Red: Approx. 4% (Change brake fluid immediately!) ❀WHAT WILL YOU GET? 1*Brake Fluid Test Pen(Battery Not Included) ❀PLEASE BE ATTENTION！ - This brake fluid tester is calibrated for DOT 4 brake fluid only, which is used in most cars produced since 2006. - Replace the battery if the green LED light no longer lights up after you press the button. - In order to extend the service life,please wash clean the test probe with tap water after every use. - In case of skin contact with brake fluid, please wash the affected skin or clothes thoroughly with plenty of water. - Do not expose brake fluid to the atmosphere for a long time as it is highly hygroscopic. ## Features - GOOD QUALITY: Quick and easy way to test for moisture content in the brake fluid; results appear in seconds! - SECURITY GUARANTEES: Approved CE,RoHS.Includes protective cap. - USE FOR: Auto Brake Fluid-DOT3 DOT4 DOT5 fluid. - CONVENIENT TO USE:5 LED Lights indicating the water % in the brake fluid.Only need to power up,dip probes into brake fluid and read results. - SATISFICATION GUARANTEED: If you're not happy with the fidget toy, let us know! We will do everything in our power to fix the issue. ## Images ![Brake Fluid Tester,HKAUS Automotive Car Testing Tool Mini Liquid Tester Auto Oil Diagnostic Pen for DOT4 - Image 1](https://images-na.ssl-images-amazon.com/images/I/51rfC8k10LL.jpg) ![Brake Fluid Tester,HKAUS Automotive Car Testing Tool Mini Liquid Tester Auto Oil Diagnostic Pen for DOT4 - Image 2](https://images-na.ssl-images-amazon.com/images/I/41NnknXxxLL.jpg) ![Brake Fluid Tester,HKAUS Automotive Car Testing Tool Mini Liquid Tester Auto Oil Diagnostic Pen for DOT4 - Image 3](https://images-na.ssl-images-amazon.com/images/I/51pT7RU-NmL.jpg) ![Brake Fluid Tester,HKAUS Automotive Car Testing Tool Mini Liquid Tester Auto Oil Diagnostic Pen for DOT4 - Image 4](https://images-na.ssl-images-amazon.com/images/I/41p0ZCpX6WL.jpg) --- ## 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.sk/products/43795227-brake-fluid-tester-hkaus-automotive-car-testing-tool-mini-liquid](https://www.desertcart.sk/products/43795227-brake-fluid-tester-hkaus-automotive-car-testing-tool-mini-liquid) --- *Product available on Desertcart Slovakia* *Store origin: SK* *Last updated: 2026-05-17*