--- product_id: 301271627 title: "Brake Fluid Liquid Tester, Auto Diagnostic Testing Tool, Oil Moisture Analyzer with 5 LED Indicators, Auto Diagnostic Checker Tool for DOT3 DOT4 Brake Fluid，Father'Day Gift" brand: "bsbmieqm" price: "49 zł" currency: PLN in_stock: true reviews_count: 10 category: "Bsbmieqm" url: https://www.desertcart.pl/products/301271627-brake-fluid-liquid-tester-auto-diagnostic-testing-tool-oil-moisture store_origin: PL region: Poland --- # 5 LED indicators for precise status Measures moisture % in brake fluid Low power AAA battery operation Brake Fluid Liquid Tester, Auto Diagnostic Testing Tool, Oil Moisture Analyzer with 5 LED Indicators, Auto Diagnostic Checker Tool for DOT3 DOT4 Brake Fluid，Father'Day Gift **Brand:** bsbmieqm **Price:** 49 zł **Availability:** ✅ In Stock ## Summary > 💧 Don’t brake your streak—test your brake fluid like a pro! ## Quick Answers - **What is this?** Brake Fluid Liquid Tester, Auto Diagnostic Testing Tool, Oil Moisture Analyzer with 5 LED Indicators, Auto Diagnostic Checker Tool for DOT3 DOT4 Brake Fluid，Father'Day Gift by bsbmieqm - **How much does it cost?** 49 zł with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.pl](https://www.desertcart.pl/products/301271627-brake-fluid-liquid-tester-auto-diagnostic-testing-tool-oil-moisture) ## Best For - bsbmieqm enthusiasts ## Why This Product - Trusted bsbmieqm brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - • **5-Level LED Precision Indicator:** Visualize brake fluid quality with clear green, yellow, and red alerts for proactive maintenance. - • **Compact & Pocket-Friendly Design:** Carry this sleek tester anywhere—fits in your pocket for on-the-go diagnostics. - • **Instant Brake Fluid Health Check:** Get real-time moisture readings in just 1 second to avoid costly brake failures. - • **Auto Power-Off for Battery Saving:** Smart shutdown after 15 seconds of inactivity keeps your tester ready when you need it. - • **Supports DOT3, DOT4 & DOT5 Fluids:** Versatile compatibility ensures you’re covered across most vehicle brake fluid types. ## Overview This digital Brake Fluid Liquid Tester offers quick, accurate moisture content analysis for DOT3, DOT4, and DOT5 brake fluids using 5 LED indicators. Powered by a single AAA battery, it features an automatic shutoff to conserve energy and a compact design for easy portability. Essential for professional-grade vehicle maintenance, it helps prevent brake system failures by signaling when fluid replacement is needed. ## Description The tester can be used as a digital brake fluid tester suitable for determining brake fluid quality. Developed for professional use in astomotive repair shops and in servicing. Quality is tested and included on five LEDs in terms of "per cent of water in the brake fluid . "Ready for Brake Fluid TestUnscrew the brake fluid reservoir, and pull off the cap of the Brake fluid tester.Dip the test probes into the brake fluid up to the plastic rim of the device.To check Fluid QualityPress the button for power on, green LED will light up. Insert the tester into reservoir for one second then the tester result will be correctly indicated by LEDs.Repress the button for power off. The tester will automatically power off after about 15 seconds of inactivity.Tester Specification:1. To check the quality of brake fluid quality2. 5 LEDs to indicate percentage of water in the brake fluid3. Automatically power off4. Operated by a LR03 AAA 1.5V battery (Not included)Tester Instructions:Brake fluid detection pen is based on the change in conductivity to determine the moisture change brake fluid. It shows clearly the extent of moisture contained by the light-emitting diode, high moisture content will lead to lower boiling point, affect braking performance. Red indicates the brake fluid needs immediate replacement, green represents good condition, yellow indicates the state is acceptable but soon replaced.1. the green LED lights = water content in the brake fluid H2O 3%, can not continue to use the brake fluid needs to be replaced Red LED: change brake fluid Tester Features:Five LED indicators show1 Review: Works well at a good price. - I tested it first with a resistance decade box (I'm an electronics nerd) and it seems to do something reasonable. Next, I tested my brake fluid. The lights shot right into the danger zone! No great surprise, I guess. The fluid is 16 years old. Next step is to get it changed. I tested it on a new bottle of DOT 4 and it showed good. Conclusion, this thing works fine for something less than $7. There are much more expensive versions, but what more would they do? Gripe? Battery holder needs work. Oh well. Review: This is a great tool that makes money - This tool makes me money for such a small investment. Contamination of brake fluid from moisture is not good. I've seen components corrode and break on older vehicles. I've pressurized vehicles and bledd bleeder screws that have not gotten regular brake flushes and the moisture content is almost always present I'm the master cylinder after using two or three quarts and the fresh fluid. usually the fluid in the master cylinder stays dark in color and I'm telling you, the fluid coming out of the bleeder screws looks clean. I'm going to begin testing the fluid coming out of the bleeder screws if they are convenient to catch and if the environment isn't excessively humid. Anyways, the way I test the pen is test fresh brake fluid in a small sample then spray a mist of water with a sprayer bottleand monitor moisture ratings with the pen. I understand you can test brake fluid with a multimeter as well but this is so cheap and convenient. This brake fluid tester and then a good flare wrench set and l maybe even offset/modified offset wrenches just in case could be good for not having to remove a tire to open bleeder screws on vehicles equipped with electronic parking brake systems. I'm paid .5 labor which means the tool pays for itself after the first brake flush, so it's a heavy hitting money tool. It's very good guys and gals. Like an amazing tool. I like to purchase a new one every few months cause I basically test every vehicle during regular maintenance. Once it's 4% or more then I suggest doing the maintenance. I've noticed vehicles who have regular flushes then the master cylinder is usually able to stay clean and keep moisture saturation low. There's only one vehicle I tested that had absolutely perfect brake fluid inside the master cylinder which happened to be a Mercedes that likely recently had a brake flush. I was impressed. ## Features - PROTECTS YOU & YOUR CAR : Check the health status of DOT3, DOT4 car brake fluid, Brake Fluid Tester Pen can be used as a digital brake fluid tester suitable for determining brake fluid quality. It will be safe for your driving1 - EATY TO USE : Press the button , Insert the tester into reservoir for one second then the tester result will be correctly indicated by LEDs.Repress the button for power off. - 5 LEDS : 5 LED display lights the percentage of moisture content in the brake fluid, as the test results are more accurate - USEFULL : Supports DOT3 DOT4 DOT5 brake fluid . - EASY TO CARRY : Small size ,you can take it in pocket , take 1 AAA 1.5V battery. automatic shutdown after about 15 seconds of inactivity ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B08NH6FLXL | | Best Sellers Rank | #25,290 in Automotive ( See Top 100 in Automotive ) #460 in Diagnostic, Test & Measurement Tools | | Brand Name | BSBMIEQM | | Customer Reviews | 4.2 4.2 out of 5 stars (1,018) | | Item Dimensions | 5.91 x 0.59 x 0.59 inches | | Item Weight | 0.02 Kilograms | | Manufacturer | BSBMIEQM | | Material Type | Metal And Plastic | | Measurement Accuracy | ±1.5% | | Measuring Range | 0% - 3% | | Model | BSB-1512 | | Output Type | LED | | Style Name | Digital | | UPC | 738192087454 | ## Product Details - **Brand:** BSBMIEQM - **Item Weight:** 0.02 Kilograms - **Item dimensions L x W x H:** 5.91 x 0.59 x 0.59 inches - **Material:** Metal And Plastic - **Style:** Digital ## Images ![Brake Fluid Liquid Tester, Auto Diagnostic Testing Tool, Oil Moisture Analyzer with 5 LED Indicators, Auto Diagnostic Checker Tool for DOT3 DOT4 Brake Fluid，Father'Day Gift - Image 1](https://m.media-amazon.com/images/I/512pcxJe2DL.jpg) ## Available Options This product comes in different **Number Of Items** options. ## Customer Reviews ### ⭐⭐⭐⭐⭐ Works well at a good price. *by B***B on June 28, 2025* I tested it first with a resistance decade box (I'm an electronics nerd) and it seems to do something reasonable. Next, I tested my brake fluid. The lights shot right into the danger zone! No great surprise, I guess. The fluid is 16 years old. Next step is to get it changed. I tested it on a new bottle of DOT 4 and it showed good. Conclusion, this thing works fine for something less than $7. There are much more expensive versions, but what more would they do? Gripe? Battery holder needs work. Oh well. ### ⭐⭐⭐⭐⭐ This is a great tool that makes money *by S***E on August 17, 2023* This tool makes me money for such a small investment. Contamination of brake fluid from moisture is not good. I've seen components corrode and break on older vehicles. I've pressurized vehicles and bledd bleeder screws that have not gotten regular brake flushes and the moisture content is almost always present I'm the master cylinder after using two or three quarts and the fresh fluid. usually the fluid in the master cylinder stays dark in color and I'm telling you, the fluid coming out of the bleeder screws looks clean. I'm going to begin testing the fluid coming out of the bleeder screws if they are convenient to catch and if the environment isn't excessively humid. Anyways, the way I test the pen is test fresh brake fluid in a small sample then spray a mist of water with a sprayer bottleand monitor moisture ratings with the pen. I understand you can test brake fluid with a multimeter as well but this is so cheap and convenient. This brake fluid tester and then a good flare wrench set and l maybe even offset/modified offset wrenches just in case could be good for not having to remove a tire to open bleeder screws on vehicles equipped with electronic parking brake systems. I'm paid .5 labor which means the tool pays for itself after the first brake flush, so it's a heavy hitting money tool. It's very good guys and gals. Like an amazing tool. I like to purchase a new one every few months cause I basically test every vehicle during regular maintenance. Once it's 4% or more then I suggest doing the maintenance. I've noticed vehicles who have regular flushes then the master cylinder is usually able to stay clean and keep moisture saturation low. There's only one vehicle I tested that had absolutely perfect brake fluid inside the master cylinder which happened to be a Mercedes that likely recently had a brake flush. I was impressed. ### ⭐⭐⭐⭐ Good brake fluid Tester *by E***1 on March 15, 2026* Brake Fluid Tester arrived on time. Quality is decent and price is very reasonable. It is very easy to use and get the moisture content reading which I believe is in acceptable range. Only con is the battery cover. You have to use a mini flat screwdriver or a knife to open the battery cover. I would have given it a 5-star review if opening battery cover was easy. ## Frequently Bought Together - BSBMIEQM Brake Fluid Liquid Tester, Auto Brake Diagnostic Testing Tool, Oil Moisture Analyzer with 5 LED Indicators, Auto Brake Diagnostic Checker Tool for DOT3 DOT4 Brake Fluid，Father'Day Gift - Mityvac MV8000 Automotive Tune-up and Brake Bleeder Kit, Selectline Hand Pump (MV8010), One Finger Vacuum Release, Ergonomic Design, Gearless Diaphragm Gauge, 4.5oz Fluid Reservoir, 4 Tapered Adapters - UTSAUTO 30Pcs Brake Bleeder Screw Caps Grease Dust Cover Brake Bleed Nipple Cap for Cars and Motorcycle --- ## 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.pl/products/301271627-brake-fluid-liquid-tester-auto-diagnostic-testing-tool-oil-moisture](https://www.desertcart.pl/products/301271627-brake-fluid-liquid-tester-auto-diagnostic-testing-tool-oil-moisture) --- *Product available on Desertcart Poland* *Store origin: PL* *Last updated: 2026-05-08*